Local-battery telephone equipment - USA Voorschrift, Technical Manual, 11-457 Signal communication equipment directory : radio communication equipment - USA Voorschrift, Technical Manual, 11-227 Handbook no. 2c(2). Communications for Beach and Build-Up Oraganisation. WO 8620 - Engeland Voorschrift Signal Corps : Fixed signal communication systems - USA Voorschrift, Army Regulations, No. 105-20 Line units BE-77, BE-77-A and BE-77-B - USA Voorschrift, Technical Manual, 11-359
