Columbia subject headings:
Blue Nile River (Ethiopia and Sudan)--Discovery and exploration.
Explorers--Blue Nile River (Ethiopia and--Biography.
Explorers--Ethiopia--Biography.
Paez, Pedro, 1564-1622.
Harvard subject headings:
Princeton subject headings:
Blue Nile River (Ethiopia and Sudan)--Discovery and exploration.
Discoveries in geography.
Ethiopia--Description and travel.
Explorers--Spain--Biography.
Jesuits--Spain--Biography.
Missionaries--Spain--Biography.
Paez, Pedro, 1564-1622.
Sudan--Description and travel.