1. Nutrient element changes in leatherleaf ferns with different stages of growth;Fitts;Proceedings of the Florida State Horticultural Society,1983
2. A critical evaluation of indigenous forest management;Geldenhuys,1983
3. Effects of frond harvesting on growth of the fern Rumohra adiantiformis in the southern Cape forest;Geldenhuys,1986
4. Interrelationships between vegetation and site characteristics in the Gouna forest;Geldenhuys;S. Afr. For. J.,1980
5. Strassburger’s textbook of botany;Harder,1965