Storage batteries for signal communication except those pertaining to aircraft - USA Voorschrift, Technical Manual, 11-430 Electrical communication systems equipment - USA Voorschrift, Technical Manual, 11-487 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