| 其他書名 | A Practical Discussion of the Raising, Marketing, Handling and Use of the Wheat Crop, Relating Largely to the Great Plains Region of the United States and Canada |
| 出版 | Campbell soil culture Publishing Company, 1914 |
| URL | http://books.google.com.hk/books?id=hz4uAAAAYAAJ&hl=&source=gbs_api |