2004,Miniature Sheet on The Great Trigonometrical Survey. Issued in 2004.The MS is with picture of Nain Singh & Radhanath Sikdar. Statement on MS is as under,The Great Trigonometrical Survey, the foundation of future topographical surveys,gave impetus to growth in Science and technology leading to major infrastructural developments, Issued on 28 June 2004, Size: 76 x 117mm , (Phila # MS 2210)