History 2,253 Sources 216 Regimental histories 163 Societies, etc 109 Histoire 104 Taxation 100 Finance, Public 94 more ... Indians of North America 87 Politics and government 83 Economic conditions 80 Militia 71 History, Local 64 Pennsylvania Infantry 63 Genealogy 62 Social life and customs 62 Soldiers 49 Germans 47 Description and travel 46 Pennsylvania Dutch 46 Biography 45 Railroads 45 Appropriations and expenditures 44 African Americans 39 Quakers 39 Campaigns 37 Education 37 Revolution 35 Registers 33 Registers of births, etc 33 Social conditions 33 Bibliography 29 Coal mines and mining 28 History, Military 28 Periodicals 28 Church history 26 Archives 25 Emigration and immigration 25 Society of Friends 25 German Americans 23 Gettysburg, Battle of, Gettysburg, Pa., 1863 22 less ...