India and Indian Ocean. Heezen, B.C., and Tharp, Marie (1965. Descriptive Sheet to Accompany Physiographic Diagram of the Indian Ocean. New York: Columbia University and Geological Society of America. Three b/w printed maps and text on sheet 112 x 86cm folding to 28 x 21cm. Each map in sheet quadrant 56 x 43cm and text in 4^th quadrant. The sheet has minor marginal tears and is slightly soiled on the two panels facing outwards when folded, otherwise it is clean and unmarked. The maps are 10 Physiographic Provinces, after Lobeck, 2) Bathymetric Sketch of the Indian Ocean, and 3) Control Chart [showing] all sounding lines. In good condition.