Rao, Indumati Vigyan Seekhna (Part.1) : Vishwa, Saur mandal, Prithvi / Indumati, Rao and C.N.R Rao - New Delhi : National Book Trust, 2019. - 93 p. : 24 cm. ISBN: 9788123756233 Subjects--Topical Terms: 1. Science--Study and teaching Dewey Class. No.: 500 / RAO/V