Overland Explorations of the Trans-Mississippi West

In 1528, the Spanish explorer Alvar Nunez Cabeza de Vaca and his three companions were shipwrecked and, looking for help, began an eight-year trek through the deserts of the American West. Over three centuries later, the four ""Great Surveys"" in the United States were consolidated into the US Geological Survey.

In 1528, exploratorul spaniol Alvar Nunez Cabeza de Vaca si cei trei tovarasi ai sai au naufragiat si, in cautare de ajutor, au inceput o calatorie de opt ani prin deserturile vestului american. Peste trei secole mai tarziu, cele patru „„ Surveys Great ”din Statele Unite au fost consolidate in Studiul Geologic al SUA.