History 304 Discovery and exploration 243 Colonies 199 Politics and government 68 Description and travel 66 Bibliography 59 Norse 38 more ... Spanish 38 Antiquities 33 Indians of North America 32 Administration 29 Sources 29 Indians 28 Causes 27 Catalogs 26 Emigration and immigration 26 English 26 Commerce 22 French 21 Rare books 20 Germans 16 Revolution 16 Books 14 British 13 Maps 13 Origin 13 Prices 13 Slavery 13 Civilization 11 Economic conditions 11 Travel 11 Genealogy 10 Histo 10 Printing 10 Discoveries in geography 9 Biography 8 Blacks 8 Cartography 8 Disc. and explor 8 Explorers 8 less ...