| 其他書名 | Tests of Sprays Against the European Fruit Lecanium [Lecanium Corni Bouché] and the European Pear Scale [Epidiaspis Pyricola Del. Guer.] |
| 出版 | U.S. Government Printing Office, 1909 |
| URL | http://books.google.com.hk/books?id=Ta7YzAEACAAJ&hl=&source=gbs_api |