共 50 条
- [43] THE REAL BOOK ABOUT OUR NATIONAL-PARKS - KEYES,NB ELEMENTARY ENGLISH, 1958, 35 (05): : 353 - 353
- [44] HOW US CAVALRY SAVED OUR NATIONAL PARKS - HAMPTON,HD AMERICAN HISTORICAL REVIEW, 1973, 78 (03): : 737 - 738
- [47] OUR COMMON LANDS - DEFENDING THE NATIONAL-PARKS - SIMON,DJ PUBLIC HISTORIAN, 1990, 12 (03): : 115 - 119