History 13 Prisoners and prisons 4 Cholera 3 Medical care 3 Military hygiene 3 Civilian relief 2 Gettysburg, Battle of, Gettysburg, Pa., 1863 2 more ... Great Central Fair for the U.S. Sanitary Commission (1864 : Philadelphia, Pa.) 2 Spouses--Correspondence--19th century 2 United States 2 United States. Army of the Potomac 2 United States. Army. Corps of Engineers--History--19th century 2 history 2 African Americans--History--Negro Education--Late 19th Century 1 Armenia--History 1 Armenian massacres, 1894-1896 1 Art and Artists--Pennsylvania--Philadelphia--19th century 1 Bull Run, 1st Battle of, Va., 1861 1 Campaigns 1 Centennial Exhibition (1876 : Philadelphia, Pa.) 1 Charitable Organizations--Philadelphia 1 Choléra 1 Civil War, 1861-1865 1 Cuba--1890-1910 1 Department stores 1 Disaster Relief--National and International 1 Disease Outbreaks 1 Dreer, Ferdinand J. (Ferdinand Julius), 1812-1902 1 Executors and administrators 1 Forests and forestry 1 Frederick (Md.) 1 Frederick, Maryland 1 Freemasons--Philadelphia--19th century 1 Histoire 1 Hospitals, charities, etc 1 Hydrographic surveying--Mississippi River 1 Hygiène militaire 1 Indian Rights Association 1 Indians, Treatment of--North America 1 Johnstown Flood 1 less ...