From the U.S. Army's The Big Picture television series, 1950-1975
"This episode tells the story of several Inter-American Geodetic Survey teams and their adventures in mapping the jungles, deserts, plateaus and the towering Andes of Latin America. The recently discovered ruins of the ancient Incan city of Machu Pichu and the mapping of the tragic town of Ranrahirca buried in the avalanche of January,1962, from before and after aerial photographs play an important part in the story. The IAGS program, begun in 1946, involves the U.S. and 17 Latin American countries. The U.S. Army Corps of Engineers plays a key role in the training of the teams and assisting in the actual 'Mapping Adventure.'"--National Archives and Records Administration
