Compiled by Walter F. Wright, Captain, Field artillery. "The course in electrical communications for Field Artillery falls naturall into three parts: (1) elementary electricity; (2) telephones nad switchboards, and (3) radio communication."
United States Works Progress Administration (New York, N.Y.)
Tables of grid coordinates ... computed ... by the Project for the computation of mathematical tables ... The basic formulas upon which the tables have been developed are from Special publication no. 59, U.S. Coast & Geodetic Survey.--Pref.