共 50 条
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- [2] The Conservation of Natural Resources in the United StatesECONOMIC JOURNAL, 1910, 20 (80) : 606 - 607Bickerdike, C. F.
- [4] The Conservation of Natural Resources in the United StatesBULLETIN OF THE AMERICAN GEOGRAPHICAL SOCIETY OF NEW YORK, 1911, 43 (04): : 295 - 296Emerson, F. V.
- [9] The role of the natural resources conservation service in the development and implementation of soil and water conservation policies in the United StatesSOIL AND WATER CONSERVATION POLICIES AND PROGRAMS: SUCCESSES AND FAILURES, 2000, : 45 - 49Johnson, PW
- [10] The Conservation of Natural Rcsources in the United StatesANNALS OF THE AMERICAN ACADEMY OF POLITICAL AND SOCIAL SCIENCE, 1911, 37 (03) : 211 - 211Tower, Walter S.