National Geographic November 1940

Tin, the Cinderella Metal
Originating in remote Bolivian mines, tin has become vital to the United States.
Burma Road, Back Door to China: Like the Great Wall of Ancient Times, This Mighty Mountain Highway Has Been Built by Myriad Chinese to Help Defend Their Homeland
Crossing a dozen mountain ranges and meandering in the footsteps of Marco Polo through remote villages and waterfalls, the Burma Road runs from Chunking ( Chongging) to Rangoon ( Yangon) .
Indian Tribes of Pueblo Land
First discovered 400 years ago by Spanish explorers, the ancestors of the Pueblo Indians in the American Southwest still protect their customs.
Saba, Crater Treasure of the Indies
The steep Caribbean island of Saba, a Dutch colony, lies a hundred miles southeast of the U. S. Virgin Islands.
America’s New Crescent of Defense
The United States develops eight new military bases in the Caribbean Sea in order to protect the Panama Canal.