This collection consists of a bound typescript manuscript of
Data for a Handbook on the Northern District of Baja California, compiled by Captain Harrington Willson Cochran, M.I.D., under the direction of the Department Intelligence Officer, Intelligence
Office, Headquarters, Western Department, San Francisco, California, November 23, 1919. This is an unpublished work of 362
pages, including approximately 421 original photographs (taken by Cochran) and ten maps. Cochran's work provided the basis
Handbook on Lower California (Military Intelligence Division, 1920).