@book{4541,
	title = {Library of Congress Classification. Class Q. Science},
	publisher = {: The Library of Congress},
	year = {1989},
	address = {Washington},
	edition = {7th ed.},
	note = {Kept up to date by the division's L.C. classification--additions and changes, and by two publications irregularly issued by Gale Research Company entitled: Library of Congress classification schedules--a cumulation of additions and changes, Class Q an d Library of Congress classification schedules combined with additions and changes.}
}