Psacharopoulos George Ed. Information An essential factor in educational planning and policy Psacharopoulos George Ed. - Paris United Nations Educational Scientific and Cultural Organization 1980 - 303p. cm. ISBN: 9231016687 Standard No.: 77594 Source: Textual Subjects--Topical Terms: LIBRARY SCIENCE Dewey Class. No.: 2N7x, M0-;1