1. IOR/L/PS/20/D66 Reference (shelfmark): IOR/L/PS/20/D66 Title: Routes in Sikkim. Compiled by Cpt W F O'Connor, Royal Garrison Artillery Calcutta: Intelligence Branch, Quarter Master General's Dept, 1900 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1900 Extent: iv, 90pp 2 maps (in pocket)