Context

Context of Topographic map of quadrangles 3772, 3774, 3672, and 3674, Gaz-Khan (313), Sarhad (314), Kol-I-Chaqmaqtin (315), Khandud (319), Deh-Ghulaman (320), and Erftah (321) quadrangles, Afghanistan, compiled by Bohannon, Robert G. ; Department of the Interior, U.S. Geological Survey ; prepared in cooperation with the Afghan Geological Survey ... [et al.], (electronic resource)
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