Gustaf Nordenskiöld (29 June 1868 – 6 June 1895) was a Swedish scholar of Finnish-Swedish descent who was the first to scientifically study the ancient Pueblo ruins in Mesa Verde. He was a member of the Nordenskiöld family of scientists and the eldest son of polar explorer Baron Adolf Erik Nordenskiöld and his equally aristocratic wife, Anna Maria Mannerheim.
Nordenskiöld completed school at Beskowska skolan in Stockholm and studied at Uppsala University and the new University of Stockholm, graduating with a B.A. from Uppsala in 1889. The next year (1890) he traveled to Svalbard together with J. A. Björling and A. Klinckowström, bringing a collection of plant fossils back to the Swedish Museum of Natural History. After his return, he was diagnosed with tuberculosis and went to Berlin for treatment.
Nordenskiöld's North American segment of a world tour began when he landed in New York on 27 May 1891 aboard the SS Waesland of the Red Star Line. (Letters Letter No. 2, The Letters of Gustaf Nordenskiöld Mesa Verde 1991). In Letter No. 9 from Charleston, North Carolina, he tells his father to address letters to the Swedish Consulate in San Francisco and on 27 June 1891 he wrote to his mother from Denver, Colorado, and included a request that further letters be addressed to the Swedish Consulate in Yokohama, Japan, so the world tour was still on his mind. Three days later, on 30 June 1891, also from Denver, he tells his father that tomorrow he was going to Durango, Colorado, and the "Mancos Valley" where there are a "number of cliff dwellings".
This break in the intinerary of his world tour was permanent.
When Nordenskiöld arrived in Durango he made arrangements to stay with cattle rancher Richard Wetherill at the Alamo Ranch in Mancos, Colorado. This is confirmed in a 2 July 1893 letter to his father in which he requests his photographic equipment, consisting of camera, tripod, lens, cassette for photographic plates, shutter, dark cloth, and "as well as my barometer". (Letters Letter No. 15, The Letters of Gustaf Nordenskiöld Mesa Verde 1991.) He also says in the same letter that his father should answer by telegram whether he should remain where he is.
He worked with Wetherill, discoverer of the Mesa Verde ruins in 1888, and Charles Mason. The Wetherill's led Nordenskiöld through the canyons and sandstone cliffs of the Mesa Verde ruins where he applied his European scientific training, conducting the first archaeological excavation of the cliff dwellings.  Nordenskiöld employed Wetherill to supervise excavations at Mesa Verde and trained Wetherill in a number of techniques, such as how to use a trowel (he had been using a shovel). Nordenskiöld explained to Wetherill the importance of documentation. 
In the late 19th century, there were no laws against treasure-hunting or selling artifacts in Colorado;  in addition to the ever-present threat of vandalism and looting, scholars and tourists alike had the habit of taking valuable items from Mesa Verde as trophies.  In this climate, Nordenskiöld loaded Mesa Verde artifacts into Denver and Rio Grande Western Railroad boxcars in Durango, Colorado,  and headed for Europe, with most of the items eventually ending up at the National Museum of Finland. 
Nordenskiöld biographers Judith Reynolds and David Reynolds describe the ensuing situation as an "international incident."  Angry locals charged Nordenskiöld with "devastating the ruins" and had him arrested at midnight at the Strater Hotel even though there were no laws at the time supporting such a charge.  In addition to the issue of removing artifacts, xenophobia may have played a role in Nordenskiöld's arrest. In the December 9, 2005, Denver Post article, Electra Draper wrote: "...residents of Durango were beginning to think foreigners shouldn't be removing local artifacts."  No intervention was taken against Americans who were also looting the sites. 
When Nordenskiöld was arrested on 17 September 1891 he sent this telegram to his father: "much trouble some expense no danger" (original omits capitalization). Letters Letter No. 31, The Letters of Gustaf Nordenskiöld Mesa Verde 1991.
In the end, Nordenskiöld took more than 150 photographs of Mesa Verde, and logged multiple sites.
In the preface to his 1892 book "From the American West Memories of America" Nordenskiöld states "The free roaming nomadic life, which this research forced me into, appealed greatly to my spirit and created a desire for excursions farther into the deserts of the American West. I decided to go roaming on horseback with two companions through the northern part of Arizona." He made this trip, actually through Indian country in Colorado, Utah and Arizona, which went as far as the Grand Canyon. Originally published in a Stockholm Newspaper and later as a book, "From the Far West Memories from America". (Kungl. Boktryckeriet P.A. Norstedt & Soner Stockholm, 1892. In English, The Mesa Verde Museum Association, Mesa Verde National Park, CO 81330)
In 1893 published one of the first books about Mesa Verde, The Cliff Dwellers of Mesa Verde, Southwestern Colorado: Their Pottery and Implements, a monumental report of his excavations, describing in detail the buildings, pottery, skeletal remains, and tools found at the sites.  
A full rendering of Gustaf Nordenskiöld's book in the 1893 version (see pg. v) is here http://babel.hathitrust.org/cgi/pt?id=inu.30000029476458. (Courtesy of the Hilthi Trust Digital Library, University of Michigan Library.)
After his return from America, Nordenskiöld occupied himself with mineralogical studies, but his health started to deteriorate again in 1894. He died on June 6, 1895, aboard a train traveling to Jämtland, only 27 years old.
Nordenskiöld's collections from Mesa Verde were bought by a Finnish collector who eventually donated them to the University of Helsinki. They are now held by the National Museum of Finland and were on display at the Museum of Cultures in the Tennispalatsi building in central Helsinki, as part of the collection called "Fetched from Afar" (Kaukaa Haettua) until 19 May 2013.  The Royal Swedish Academy of Sciences contains an archive of photographs, notes, correspondence and newspaper clippings. The Riksarkivet includes letters to his father from Washington, Philadelphia, Charleston, Mammoth Cave (in Kentucky), Durango, Navajo Canyon, and other locations.  The Center of Southwest Studies, Fort Lewis College, Durango, CO https://web.archive.org/web/20091105155354/http://swcenter.fortlewis.edu/index.shtml
- 1979: The Cliff Dwellers of the Mesa Verde, Southwestern Colorado: Their Pottery and Implements. Appendix: Human remains from the Cliff Dwellings of the Mesa Verde. G. Nordenskiold. Translated by D. L. Morgan. Reprinted 1979. Rio Grande Press, Glorieta, New Mexico. Originally published in 1893 as Ruiner af Klippboningar I Mesa Verde's Cañons. Stockholm: P. A. Norstedt & Söners.
- 1990: The Cliff Dwellers of the Mesa Verde, Southwestern Colorado: Their Pottery and Implements. Appendix: Human remains from the Cliff Dwellings of the Mesa Verde. G. Nordenskiold. Translated by D. L. Morgan. Mesa Verde. Reprinted 1990. Mesa Verde Museum Association. Originally published in 1893 as Ruiner af Klippboningar I Mesa Verde's Cañons. Stockholm: P. A. Norstedt & Söners.
- 1991: "The Letters of Gustaf Nordenskiold" with Articles from Ymer and Photographic Times. Mesa Verde Museum Association. ISBN 0-937062-16-2.
- Wilcox, David R. Fowler, Don D. (Summer 2002). "The beginnings of anthropological archaeology in the North American Southwest: from Thomas Jefferson to the Pecos Conference." Journal of the Southwest 44.2 : p121(114).
- Roberts, David. (Dec 1993). "'Reverse archaeologists' are tracing the footsteps of a cowboy-explorer." Smithsonian. v24.n9 : pp28(10).
- Chalmers, Robin. (Sept 1999). "A Historic Rediscovery." Cobblestone. 20.6. p.20.
- Noel, Tom. (Jan 1, 2005). "Two Women Ensured a Future for Our Past". Rocky Mountain News. p2D.
- Draper, Electra. (June 26, 2006). "Mesa Verde artifacts ended up in Sweden." The Denver Post. pB-05.
- Draper, Electra. (Dec 9, 2005). "Mesa Verde sites glow for park's birthday bash." The Denver Post. p. A01.
- Michael C. FitzGerald, "The Majesty of Mesa Verde" in Wall Street Journal, 2009 March 13, p. W12.
- Bear, David. (Sept 6, 2001). "Blackened Mesa Verde is Reborn to the Hardy Curious". Seattle Post-Intelligencer. p8.
- "Archived copy". Archived from the original on 2011-06-11. Retrieved 2009-04-10. "Archived copy". Archived from the original on 2011-06-11. Retrieved 2009-04-10.
- Lindberg, Christer. (Spring 1993). "Sweden." The American Indian Quarterly 17.n2 : 251(5).
- The Cliff Dwellings of the Cañons of the Mesa Verde:
Publisher(s): American Geographical Society; Author(s): W. R. Birdsall; Source: Journal of the American Geographical Society of New York, Vol. 23, (1891), pp. 584–620
- The Cliff Dwellers of the Mesa Verde:
Publisher(s): American Geographical Society; Reviewed Authors(s): G. Nordenskiold; Source: The Journal of the Anthropological Institute of Great Britain and Ireland, Vol. 23, (1894), pp. 434–435
- Stones Speak and Waters Sing, The Life and Works of Gustaf Nordenskiold, Olof Arrhenius, edited and annotated by Robert H. Lister and Florence C. Lister. Mesa Verde Museum Association 1984
- Diamond, Irving L., "Much Trouble Some Expense No Danger" Mesa Verde National Park. Proceedings of the Anasazi Symposium 1991. ISBN 0-937062-21-9.
- Reynolds, Judith, & Reynolds, David. Nordenskiold of Mesa Verde, Xlibris Corporation, April 2006. ISBN 1-4257-0484-0, paperback.[ self-published source?]