Cambridge University Press · Universitetsforlaget
| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| Macrolichens of Denmark, Finland, Norway and Sweden | Hardcover | 978-82-00-02262-6 (82-00-02262-5) | 1973 |
| The Phytogeography of Northern Europe: British Isles, Fennoscandia, and Adjacent Areas | Paperback | 978-0-521-03559-0 (0-521-03559-7) | 2007 |
| The Phytogeography of Northern Europe: British Isles, Fennoscandia, and Adjacent Areas | Hardcover | 978-0-521-38358-5 (0-521-38358-7) | 1998 |