| 其他書名 | Review of an Early Experiment on the Effects of Frequency of Harvest, Disking, Application of Barnyard Manure on Yields and Protein Content |
| 出版 | University of Illinois Agricultural Experiment Station, 1945 |
| URL | http://books.google.com.hk/books?id=8_5RAQAAMAAJ&hl=&source=gbs_api |