Elizabeth G. Pierce, 69, a former cataloguer at the Library of Congress who later worked in libraries in the Prince George's County public school system, died Friday at Prince George's General Hosptial in Cheverly following a stroke.

Mrs. Pierce was born in Alexandria, Minn,. and grew up in Towner, N.D. She earned a bachelor's degree in English and a library certificate at the University of Wisconsin.

In 1935, after working for two years for the North Dakota Library Commission, she moved to Washington and became a cataloguer at the Library of Congress. In 1945 and 1946, she worked in the Rare Book Room of the Butler Library at Columbia University in New York on an exchange basis. In 1949, she resigned from the Library of Congress to raise her family.

In the early 1960s, Mrs. Pierce, who lived in Chevely, returned to her profession as assistant librarian at Bladensburg Senior High. About 1968, she transferred to Parkdale Senior High. She was head librarian there when she retired in 1973.

Survivors include her husband, Norman, of Cheverly, two sons, Philip, a student in Kiel, Germany, and Roger, of Sequim, Wash., and a sister, Constance Gregory of Miami Springs, Fla.