Varadarajan, Dhulasi Birundha Cost-benefit analysis of bio gas plants [Book] / Dhulasi Birundha Varadarajan, D. Farima Baby. - New Delhi : Ashish Publishing House, c1995. - xi, 111 p. : 23 cm. All ISBN: 8170246105 (hardback) Subjects--Topical Terms: Bio engineering.Biogas.Bio Gas Plants. Dewey Class. No.: 665.776