| 其他書名 | A Dissertation Submitted to the Faculty of the Ogden Graduate School of Science in Candidacy for the Degree of Doctor of Philosophy (department of Botany) |
| 出版 | University of Chicago Press, 1917 |
| URL | http://books.google.com.hk/books?id=pUVvtAEACAAJ&hl=&source=gbs_api |