Melvil Decimal System: 974.86
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Philosophy and Psychology
Mathematics and Science
Arts and Recreation
Biography and History
Geography, Voyages And Travel
Mexico, Central America, And The Caribbean
South Central U.S.
West Coast U.S.
Southeast counties; Philadelphia and Chester group
Eastern counties; Bucks group
Northeast counties; Northumberland group
Southeast central counties; Cumberland group
Northeast central counties; East Lycoming group
Northwest central counties; West Lycoming group
Southwest central counties; Bedford group
Southwest counties; Westmoreland group
Northwest counties; Allegheny group
Works under MDS 974.86
- The Cook Forest: An Island in Time by Anthony E. Cook
- Philadelphia's Broad Street: South and North (PA) (Images of America) by Robert Morris Skaler
- Jefferson County, Pennsylvania: An Illustrated History by Carole A. Briggs
- The city of DuBois by William C. Pentz
- A Twentieth Century History of Clearfield County, Pennsylvania (1900-2000) by Richard T. Hughes
- Along the Bucktail Highway (Postcard History: Pennsylvania) by Charles E. Williams
- Callensburg, a small community: History of Callensburg and Licking Township, 3rd ed. by Arnold Kepple
- History of Clearfield county, Pennsylvania with illustrations and biographical sketches of some of its prominent men and by Lewis Cass Aldrich
- History of Jefferson County, Pennsylvania, with illustrations and biographical sketches of come of its prominent men and pioneers by Kate M. Scott
- The Allegheny River: Watershed of the Nation (A Keystone Book) by Jim Schafer
- Around Curwensville (Images of America: Pennsylvania) by Julie Rae Rickard
- Elk County (PA) (Images of America) by Dennis McGeehan
- Clearfield County (PA) (Images of America) by Julie Rae Rickard
- The history of the DuBois Volunteer Fire Department, 1888-1988 by Pa.) DuBois Volunteer Fire Dept. (DuBois
- The Progress presents "A View From..." : A collection of stories about local communities
- The Brockway Story 1822-1986 : A narrative history of the Brockway Area, Jefferson County, Pennsylvania by Lewis D Reddinger
- From the Miners' Doublehouse: Archaeology and Landscape in a Pennsylvania Coal Company Town by Karen Bescherer Metheny
- Legends of Clearfield County by Melvin G. Lingle
- Twentieth century history of Clearfield County, Pennsylvania, and representative citizens by Roland D. Swoope
- Curwensville Old and New by Brandt Rowles
- Ridgway (PA) (Images of America) by Dennis McGeehan
- History of the Counties of McKean, Elk, Cameron, & Potter, Pennsylvania by J. H. Beers & Co.
- The hills of home : historical times and tales of the Sabula community by Jennie Smith Dixon
- Pioneers Of Second Fork by James P. Burke
- DuBois Centennial - : 100th anniversary of DuBois Pennsylvania, 1872-1972
- Guide book to the DuBois area by DuBois Area Chamber of Commerce
- A compiled history Big Run, Jefferson County, Pennsylvania; celebrating 150 years, Big Run Pennsylvania 1867-2017 by Shirley J. Sharp, ed.
- Ridgway: Our Town; A children's coloring book by Alice L. Wessman, comp. and ed.
- The Last raft by Joseph Dudley Tonkin
- Polk city directory. DuBois Pennsylvania
- The DuBois Campus of the Pennsylvania State University : a Fiftieth anniversary history, the Golden celebration of campus with community, 1935-1985 by John W. Furlow
- The century farms of Jefferson County, Pennsylvania by Jean K. Harriger, ed
- A History of Cameron County, Pennsylvania
- The best of Reflections by Jr. Jason S. Gray
- 1804-1904, Clearfield County's centennial celebrated at Clearfield, Pa., July 26, 27, 28 and 29 by J. Frank Snyder
- A pioneer history of Jefferson County, Pennsylvania : and my first recollections of Brookville, Pennsylvania, 1840-1843, by W J McKnight
- Warren County Boys Over There by Warren Historical Company
- Western Pennsylvania's Oil Heritage (Postcard History: Pennsylvania) by Charles E. Williams
- The Great DuBois fire : 90th anniversary, June 18, 1888-June 18, 1978
- Remembering Jefferson County : from pioneers to aviators by Randon W. Bartley
- Reformed Protestant Dutch church in Philadelphia : an historical discourse by William J. R. Taylor
- A history of Brookville, Pennsylvania, 1888-1974 by Robert Steiner Craig
- Punxsutawney centennial, 1849-1949 by Punxsutawney High School Department of English, comp. and ed.
- Commemorative biographical record of central Pennsylvania : including the counties of Centre, Clinton, Union and Snyder, containing biographical sketches of prominent and representative citizens, and many of the early settled families : illustrated
- Pennsylvania radio by Charles Archibald Moore
- History of Reynoldsville and vicinity including Winslow Township by Ward C Elliott
- A history of Beechwoods a farming and mining community in Western Pennsylvania by James Howard Sterrett
- A Proud People, A Proud Heritage: The History of Clarion County's Knox Township area, Lucinda, Snydersburg, Huefner and by Compiled by the history committee of St. Joseph Pa
- Archaeological and historical investigation metropolitan detention center site (36 PH 91), Philadelphia, Pennsylvania
- DuBois where and when, DuBois now and then : an interactive history for youth from 5 to 95! by Janice Flood Nichols
MDS classes with significant recommendations overlap, excluding ones under the same top-level class.
What is MDS?
Melvil stands for "Melvil Decimal System," named after Melvil Dewey, the famous librarian. Melvil Dewey invented his Dewey Decimal System in 1876, and early versions of his system are in the public domain.
More recent editions of his system are in copyright, and the name "Dewey," "Dewey Decimal," "Dewey Decimal Classification" and "DDC" are registered trademarked by OCLC, who publish periodic revisions.
LibraryThing's MDS system is based on the classification work of libraries around the world, whose assignments are not copyrightable. MDS "scheduldes" (the words that describe the numbers) are user-added, and based on public domain editions of the system.
The Melvil Decimal System is NOT the Dewey Decimal System of today. Wordings, which are entered by members, can only come from public domain sources. The base system is the Free Decimal System, a public domain classification created by John Mark Ockerbloom. Where useful or necessary, wording comes from the 1922 edition of the Dewey Decimal System. Language and concepts may be changed to fit modern tastes, or to better describe books cataloged. Wordings may not come from in-copyright sources.