Plant species and plant communities : proceedings of the International Symposium held at Nijmegen November 11-12, 1976, in honour of Professor Dr. Victor Westhoff on the occasion of his sixtieth birthday - Maarel, E. van der; Werger, Marinus J. A. (The Hague : W. Junk bv Publishers, 1978)
Includes bibliographies
Keywords: Plant communities -- Congresses; Plant populations -- Congresses