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www.libraryspot.com/librariesonline.htm

www.oclc.org/dewey/about/ddc_21_summaries.htm

First Summary
The Ten Main Classes

000 Computers, information, & general reference
100 Philosophy & psychology
200 Religion
300 Social sciences
400 Language
500 Science
600 Technology
700 Arts & recreation
800 Literature
900 History & geography

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The Library of Congress system is very different, employing letters and numbers to organize a library's collection. A list of the main letters and descriptions, with links to .PDF files, can be found at:

http://www.loc.gov/catdir/cpso/lcco/lcco.html


http://www.familysearch.org/


Index to Irish films at the Family History Library : includes names from wills, ...
Parsons, Joyce
   
 Film/Call Numbers  -  Description  
  
CopiesFHL BRITISH Reference
941.5 D22pj v. 1
FHL BRITISH Reference
941.5 D22pj v. 2  
FHL BRITISH Reference
941.5 P22pj  
FHL BRITISH Reference
941.5 D22pj v. 3

Film Note Location
Film  
Also on microfilm. Salt Lake City : Filmed by the Genealogical Society of Utah, 1997-1999. on 3 microfilm reels ; 35 mm.  
Vol. 1 FHL British
Film 1559440 Item 11
Vol. 2 FHL British
Film 1696675 Item 9
Vol. 3 FHL British
Film 1145946 Item