1507-1559 active16thcentury alvar america arcticregions award:national_book_award=1986 award:national_book_award=nonfiction biography canada descripcionesyviajes descriptionandtravel discoveryandexploration españoles explorers fuentes history indiansofnorthamerica indiosdeamericadelnorte landschappen narvaez nationalbookawardwinner naturalhistory nuñezcabezadevaca núñezcabezadevaca panfilode spain spanish