Philadelphia houses a proud past
Harold Donaldson Eberlein
págs. 151-191
The city they call Red China's showcase
Franc Shor
págs. 193-222
Man's deepest dive
Jacques Piccard
págs. 224-239
The dauntless little stilt
Frederick Kent Truslow
págs. 241-245
Salzkammergut: Austria's alpine playground
Beverley M. Bowie
págs. 246-275
Knocking out grizzly bears for their own good
Frank C. Craighead, John Craighead
págs. 277-291
Our earth as a satellite sees it
W. G. Stroud
págs. 293-302
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