They explored!
Subtitle: Humboldt, Livingstone, Frémont, Hedin, Scott, Herzog.
By: By Rhoda Hoff & Helmut de Terra.
Contributors: De Terra, Helmut, 1900- joint author.
Publisher: H. Z. Walck
Published: 1959
Place of publication: New York
Language: eng
Number of pages: 120
Subjects: Explorers.