Sheet 23F : Sheet I-40J Naginu K501 1:250,000 Edition 2-AMS 1961. First printing 12-61. Copied from First GSGS Edition, 1942. Compiled and published originally SGI 1931 and revised to 1941. Heliographed OSO 1942. Printed AMS 12-61. UTM Grid.
Sheet 23J : Sheet I-40K Juimand K501 1:250,000 Edition 2-AMS 1961. First printing 6-61. Copied from First GSGS Edition, 1942. Compiled and published originally SGI 1922 and revised to 1941. Printed AMS 6-61. UTM Grid.
Sheet 23N : Sheet I-40L Rushkar K501 1:250,000 Edition 2-AMS 1961. First Printing 11-61. Copied from First GSGS Edition, 1942. Compiled and published originally SGI 1921 and revised to 1941. 1036/5/42 L.R. Printed AMS 11-61. UTM Grid.