Studies on fosil plants /

by Alvin, Kenneth Leonard, Alvin, Kenneth Leonard
Published 1968

International Code of Botanical Nomenclature : (Tokyo code) : adopted by the Fifteenth International Botanical Congress, Yokohama, August-September 1993 /

by Greuter, Werner Rodolfo 1938-, Greuter, Werner Rodolfo 1938-
Published 1994