Prakashan Avam Suchana Nideshalya.New Delhi. Bharat Ki Sampada Prakrutik Padhariha 2Nd Kh.K - 1st Ed. - Vidnyanic Av Audogik Anusandhan Parishad Nayi Delhi 1972 - XXII, 424p. 22 cm. Text in English Subjects--Facted Index Terms: REF Dewey Class. No.: / PRA