1) Original 1937 Geco 50th anniversary catalog (65. 13 500. 8. 37.), 437 pages presenting products sold by Geco such as revolvers, semi-automatic pistols, rifles, shotguns, cartridges, binoculars, pocket knives, reloading tools, and much more. 2) Gerhard Bock's book "Moderne Faustfeuerwaffen und ihr Gebrauch" (Modern handguns and their use), published in 1941 with 462 pages featuring illustrations and black and white photographs in the text. This book was really intended as an instruction and shooting guide in pre-war Europe. This covers many European (Mauser, Walther, Browning, and Sauer) pistols as well as several U.S. manufactured pistols such as Colt and S&W, almost like a European copy of a Shooter's Bible.