00435nam a22001337a 4500 (hb) 657.2 JAF Jaffar, S.M. Record keeping numerical system Peshawar Government Printing & Stationary 1951 viii, 51 p. : ill. ; 18 cm. Record keeping Double-Head Numerical system Register-Pending Some safeguards Essentials Evolution IIMC BK 7224 7224