Aerial photography 2 Airplanes 2 Description and travel 2 History Landscapes 2 Regionalism 2 Social aspects 2 mere ... Social change 2 Social conditions 2 20th Century 1 ART 1 ART / American / General 1 ART / History / Modern (late 19th Century to 1945) 1 American 1 Aspect social 1 Avions 1 Conditions sociales 1 Descriptions et voyages 1 General 1 HISTORY 1 HISTORY / United States / 20th Century 1 Histoire 1 Modern (late 19th Century to 1945) 1 Paysages 1 Photographie aérienne 1 Régionalisme 1 TRAVEL/United States/Midwest/East North Central (IL, IN, MI, OH, WI) 1 TRAVEL/United States/Midwest/General 1 TRAVEL/United States/Midwest/West North Central (IA, KS, MN, MO, ND, NE, SD) 1 Travel 1 mindre ...