"Research for second edition completed November 1972 ; Research for first edition completed March 1964."
"This handbook supersedes DA Pam 550-35, March 1964."
"This volume is one of a series of handbooks prepared by Foreign Area Studies (FAS) of The American University, designed to be useful to military and other personnel who need a ... compilation of basic facts about ... various countries." -- p. iii.
First ed., by Foreign Area Studies Division, American University, Washington, D.C., published in 1964 under title: Area handbook for Nepal (with Sikkim and Bhutan).