The Anasazi - DesertUSA

http://www.desertusa.com/ind1/du_peo_ana.html

Like their cultural kin – the Mogollon and the Hohokam – in the deserts to the south, the earliest Anasazi peoples felt the currents of revolutionary change during the first half of the first millennium.

https://web.archive.org/web/20080924142900/http://www.westernhagen.de/09_m_e.htm

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The Origins of Air War: Development of Military Air Strategy in World War I - Robert F. Grattan - Google Books

https://books.google.de/books?id=X0UBAwAAQBAJ&pg=PP1

Air power has come to be seen as a country’s first line of defence; in the First World War views were vastly different. Aircraft were a novelty not always welcomed by the traditionalist military. Here Robert Grattan traces the remarkable history of the…