| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Plantago section Virginica: A taxonomic revision of a group of American plantains, using experimental, taximetric and classical methods | 978-87-742O-OO9-3 (87-742O-OO9-7) | 1974 |
K. R. · Kennedy Ryan · Kenneth Romeo · Kenneth Ryan · Kent Reno