Sharma, B.C. Mitti ek- roop anek / : CSIR Golden Jubilee Series / Hindi. B. C. Sharam. - 6 Ed. - New Delhi : Publications & Information Directorate, 1993, Reprint 2016. - 86 pages : color illustrations ; 22 cm. ISBN: 8172360681 9788172360689 Dewey Class. No.: 631.4 / SHM