"This 1944 manual prescribes the knowledge and skill required to serve effectively the multiple gun motor carriages M15 and M15A1. Variations in assigned materiel may necessitate changes in the prescribed drill."
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.