Pennsylvania - 974.8 Dewey Decimal Numbers for U.S. States and Counties County Dewey Decimal Number Adams 974.842 Allegheny 974.885 Armstrong 974.888 Beaver 974.892 Bedford 974.871 Berks 974.816 Blair 974.875 Bradford 974.857 Bucks 974.821 Butler 974.891 Cambria 974.877 Cameron 974.866 Carbon 974.826 Centre 974.853 Chester 974.813 Clarion 974.869 Clearfield 974.861 Clinton 974.854 Columbia 974.838 Crawford 974.897 Cumberland 974.843 Dauphin 974.818 Delaware 974.814 Elk 974.865 Erie 974.899 Fayette 974.884 Forest 974.868 Franklin 974.844 Fulton 974.872 Greene 974.883 Huntingdon 974.873 Indiana 974.889 Jefferson 974.862 Juniata 974.847 County Dewey Decimal Number Lackawanna 974.836 Lancaster 974.815 Lawrence 974.893 Lebanon 974.819 Lehigh 974.827 Luzerne 974.832 Lycoming 974.851 McKean 974.863 Mercer 974.895 Mifflin 974.846 Monroe 974.825 Montgomery 974.812 Montour 974.839 Northampton 974.822 Northumberland 974.831 Perry 974.845 Philadelphia 974.811 Pike 974.824 Potter 974.855 Schuylkill 974.817 Snyder 974.849 Somerset 974.879 Sullivan 974.859 Susquehanna 974.834 Tioga 974.856 Union 974.848 Venango 974.896 Warren 974.867 Washington 974.882 Wayne 974.873 Westmoreland 974.881 Wyoming 974.835 York 974.841