Report on Platt and Wind Cave National Parks, etc.-Continued. National monuments and preservation of American antiquities.. ILLUSTRATIONS. Maps: Page. Map of United States, showing areas covered by geologic surveys.. 274 Map of United States, showing areas covered by topographic surveys. 328 General plan of grounds and buildings, Pittsburgh experiment station..... 387 608 Navajo National Monument, Ariz. (as amended by proclamation Mar. 14, 1912)... 703 |