History 2,076 Sources 211 Regimental histories 161 Societies, etc 108 Taxation 98 Finance, Public 94 Economic conditions 75 more ... Indians of North America 71 Militia 71 Politics and government 70 Pennsylvania Infantry 63 History, Local 62 Genealogy 59 Histoire 57 Social life and customs 49 Soldiers 45 Appropriations and expenditures 44 Biography 44 Railroads 38 Germans 37 Pennsylvania Dutch 37 Description and travel 36 Education 35 Revolution 35 Campaigns 34 Quakers 33 Registers 33 African Americans 32 Registers of births, etc 31 Bibliography 28 Periodicals 27 Archives 25 Church history 25 History, Military 25 Social conditions 25 Coal mines and mining 23 Gettysburg, Battle of, Gettysburg, Pa., 1863 22 Personal narratives 22 Coal miners 21 German Americans 21 less ...