Proceedings of the International Symposium on Systematic PteridologyK. H. Shing, Karl Ulrich Kramer, Zhongguo ke xue ji shu xie hui, Guo jia zi ran ke xue ji jin wei yuan hui (China), China) International Symposium on Systematic Pteridology (1988 Peking · First published 1989Open the Tome
A sketch of the vegetation and flora of the Kappel savanna near Tafelberg, SurinameKarl Ulrich Kramer, J. van Donselaar · First published 1968Open the Tome
A revision of the genus Lindsaea in the new world with notes on allied generaKarl Ulrich Kramer · First published 1957Open the Tome
