Botanical nomenclature and taxonomy : a symposium organized by the International Union of Biological Sciences with support of UNESCO, at Utrecht, the Netherlands, June 14-19, 1948
· edited by J. Lanjouw ; with a supplement to the International rules of botanical nomenclature, embodying the alterations made at the Sixth International Botanical Congress, Amsterdam, 1935, compiled by T. A. Sprague
Bok Engelsk 1950