Sheet 25K : Sheet G-40Q Gabrig GSGS 3919 First Edition 1942. Compiled and published originally SGI 1910 and revised to 1941. Five- and ten-fathom lines from Admiralty Chart 2837A dated 1862 with corrections to 1939. Published WO 1942. Heliographed OSO 1942. 1,036/7/42F. Grid II A.