Discovery and exploration History 275 Description and travel 191 Discoveries in geography 117 Indians of North America 97 Explorers 90 Spanish 89 more ... Travel 73 Découverte et exploration 50 French 45 Histoire 39 Descriptions et voyages 38 Publications by Graduates 34 Fur trade 32 Colonies 29 Frontier and pioneer life 27 Missions 25 Overland journeys to the Pacific 22 British 21 Natural history 19 Pioneers 19 American 17 Sources 17 Geology 13 Indiens d'Amérique 13 Territorial expansion 12 Publications about Graduates 11 Découverte et exploration espagnoles 10 Indians, Treatment of 10 Antiquities 9 less ...