Sheet 29C : Sheet I-41M [Shahrukh] GSGS 3919 First Edition-GSGS 1950. Reprinted from SI Interim Edition 1941. Surveyed 1918-19; supplemented by extra-departmental information. Published WO 1950. Reproduced OS 1950. 1,000/11/50. Persian-Afghan boundary from extra-departmental sources. Grid I.