The document discusses topographic maps and their numbering systems in India. It provides details on: 1) Topographic maps represent relief and also show features like transportation and settlements. They contain information like names, scales, and features. 2) In India, the Survey of India prepares topographic maps. Maps are part of two series - the India and Adjacent Country Series and the International Map of the World Series. 3) The India and Adjacent Country Series covers India in grids numbered from 40-92 that are divided into degree, quadrant, and special sheets at various scales with contour intervals.