How do I correlate a Dewey number with a Library of Congress classification number or Library of Congress Subject Heading?
A subscription database known as Classification Web provides correlations between Dewey and Library of Congress classification numbers, as well as between these call numbers and Library of Congress Subject Headings. You can check with your local library to see if it has access to this database. A print resource which provides a similar function, though not as comprehensively, is the 3rd edition of Mona L. Scott’s 3-volume Conversion Tables (v. 1, LC-Dewey; v. 2, Dewey-LC; v. 3, Subject Headings-LC and Dewey). A very general classification conversion tool, available for free online, is provided on OCLC’s reference management service QuestionPoint. See the following two pages: Map LC (LCC) to Dewey (DDC) Classification Map Dewey (DDC) Classification to LC (LCC) These pages note that “mappings to LCC classes D, J and K are still in process. LCC Class R has been replaced, in QuestionPoint, by National Library of Medicine (NLM) Classes QS-QZ and W. Most NLM Classes map to 362.1-362.3 and 61
