@book{25623,
	author = {Punjab Agricultural University. Department of Civil Engineering. College for Agricultural Engineering},
	title = {National seminar on biogas technology July 9-11, 1981},
	publisher = {Punjab Agricultural University},
	year = {ca. 1981},
	address = {Ludhiana},
	note = {Sponsored by UNDP/ICAR Centre for Advanced Studies in Post Graduate Agricultural Engineering Education and Research}
}