Mongolia Route Maps covering traverse of the expedition 9[s (led by] Roy Chapman Andrews) from Kalgan westward 1925 [and 1928]... Scale 1:200,000... Topography by L. B. Roberts ([and] W. P. T. Hill). Control by F. B. Butler and H. O. Robinson.
Andrews, Roy Chapman.
Butler, F. B.
Hill, W. P. T.
Roberts, L. B.
Robinson, H. O.
[Washington, D.C. :  The American Museum of Natural History, 
1925-1928]
Index.