Contains a U.S. War Department field manual on map and aerial photograph reading, and a technical bulletin containing updates to the earlier field manual.

Caption title: TB 21-25-1. "This manual supersedes chapter 5, Basic Field Manual, volume I, April 2, 1938"--Page 1, FM 21-25. "Pending revision of FM 21-25 the following revisions and additions are published for the information of all concerned. Revised paragraphs and figures are numbered as in FM 21-25. Added paragraphs and figures are numbered to indicate proper location in the manual."--Page 1, TB 21-25-1.

FM 21-25 --General -- Conventional signs and military symbols -- Map measurements -- Direction and azimuth -- Location by coordinates -- Elevation and relief -- Map reading in the field -- Aerial photograph reading -- Appendix -- TB 21-25-1 -- Conventional signs -- Scales -- (revised). Base direction -- (revised). Declination diagrams -- (revised. Azimuth -- (revised). General -- (added). Thrust line -- (revised). Military grid -- (added). Grid systems -- (added). Map template, M1 and M2 -- (added). Geographic coordinates -- (added). JAN grid -- Orientation (revised) -- Compass -- General -- (revised). Oblique -- Identifying terrain features.