共 50 条
- [1] Conservation of our natural resourcesAMERICAN ECONOMIC REVIEW, 1930, 20 (04): : 723 - 724Orten, M. D.
- [2] OUR NATURAL RESOURCES AND THEIR CONSERVATIONGEOGRAPHICAL JOURNAL, 1937, 89 (05): : 470 - 472不详
- [4] Conservation of Our Natural ResourcesECONOMIC GEOGRAPHY, 1931, 7 (02) : 215 - 216Foscue, Edwin J.
- [5] The conservation of our natural resourcesJOURNAL OF LAND AND PUBLIC UTILITY ECONOMICS, 1931, 7 (02): : 224 - 224Voskuil, W. H.
- [6] Our Natural Resources and their ConservationSCOTTISH GEOGRAPHICAL MAGAZINE, 1938, 54 (02): : 118 - 119不详
- [7] Our natural resources and their conservationPETERMANNS GEOGRAPHISCHE MITTEILUNGEN, 1938, 84 (02) : 75 - 75Hannemann, M.
- [8] Our Natural Resources and their conservation.ANNALES DE GEOGRAPHIE, 1937, 46 (262): : 419 - 419不详
- [10] THE CONSERVATION AND PROPER UTILIZATION OF OUR NATURAL RESOURCESSCIENTIFIC MONTHLY, 1922, 15 : 289 - 312Evermann, Barton Warren