Media type: E-Article Title: Trade Barriers to Knowledge: A Manual of Regulations Affecting Educational, Scientific and Cultural Materials Contributor: Clapp, Verner W. imprint: University of Chicago Press, 1957 Published in: The Library Quarterly Language: English DOI: 10.1086/618373 ISSN: 0024-2519; 1549-652X Keywords: Library and Information Sciences Origination: Footnote: