Cottrell, G. W. Jr.2020-06-091952Cottrell, G. W. Jr. 1952. Interfiling in the Widener catalogues. Harvard Library Bulletin VI (2), Spring 1952: 271-273.0017-8136http://nrs.harvard.edu/urn-3:HUL.InstRepos:42669831en-USJournal Article2020-06-09