| 其他書名 | (predicated Upon the Report of the Secretary's Committee, Dated June 5, 1935 and Memorandum of Understanding Between the Extension Service and the Soil Conservation Service). |
| 出版 | 1938 |
| URL | http://books.google.com.hk/books?id=3MQXtwAACAAJ&hl=&source=gbs_api |