Hill tribes center with Biff (Charles F. Keyes) and Čao Khana Amphoe; Biff (Charles F. Keyes), Nick, Čao Khana Amphoe, Sanga, La-aw, Phan and others; 2 photos, Ban Mae Ho, Thambon Mae Ho, Amphoe Mae Sariang, Changwat Mae Hong Son, Thailand, October 1968