Rosenberg, C E Doctors and credentials--the roots of uncertainty. [electronic resource] - Transactions & studies of the College of Physicians of Philadelphia Dec 1984 - 295-302 p. digital Publication Type: Historical Article; Journal Article ISSN: 0010-1087 Subjects--Topical Terms: Accreditation--historyHistory, 19th CenturyHistory, 20th CenturyLicensure, Medical--historyUnited States