History 2,037 Sources 168 Regimental histories 159 Histoire 103 Societies, etc 93 Indians of North America 78 Politics and government 69 more ... Pennsylvania Infantry 63 History, Local 57 Genealogy 56 Finance, Public 54 Social life and customs 54 Taxation 53 Soldiers 49 Militia 45 Description and travel 43 Economic conditions 43 Biography 42 Germans 42 Railroads 41 Pennsylvania Dutch 39 Quakers 37 Campaigns 36 Education 36 African Americans 35 Registers of births, etc 31 Registers 30 History, Military 28 Bibliography 27 Social conditions 26 Church history 25 Coal mines and mining 25 Appropriations and expenditures 24 Archives 24 Emigration and immigration 24 Society of Friends 24 Gettysburg, Battle of, Gettysburg, Pa., 1863 22 Personal narratives 22 German Americans 21 Race relations 21 less ...