Ladd, Harry S. and Brown, Roland W. FOSSILS LIFT THE VEIL OF TIME. [and] "ROCKHOUNDS" UNCOVER EARTH'S MINERAL BEAUTY. By George S. Switzer. Two extracts from National Geographic Magazine, super roy. 8vo; pp. 363-386 and pp. 631-660; numerous coloured & b/w. illustrations; binder's quarter cloth; a fine copy. [Washington; National Geographic Society]; N.D. [c. 1960]. #38357

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