Vintage 1959 FM 3-50 Department of the Army field manual Chemical smoke generator battalion and chemical smoke generator company.headquarters department of the Army January 1959. This is a nice piece of United states army history. This manual is 196 pages. this manual does have wear discoloring and other issues but is still very readable.Most of the wear is to the covers. Approximately 6 3/4 inches tall and 4 3/8 inches across.