@book{20967,
	author = {KOWALSKI, Marian Wacław},
	title = {Petrografia i geologia inżynierska /},
	year = {1981.},
	address = {Lublin,},
	url = {http://koha.tu.koszalin.pl/cgi-bin/koha/opac-detail.pl?biblionumber=20967}
}