Sheet 97N : Sheet B-47J Pak La-Ngu GSGS 4218 Second Edition-GSGS 1951. Part compiled from 1:200,000 Siamese reconnaissance map 1934 and FMS Revenue & sketch surveys previous to 1939. Published WO 1941. Second Edition 1951. Reproduced from HIND 1001 by OS 1951. 3,500/2/51. Malay Grid (Yards).