Years After Stebbins () was released to mark the occasion. References Raven, P. 1974. "Plant systematics 1947-1972." Annals of the Missouri Botanical Garden 61:166-178 Smocovitis, V. B. and Ayala, F. J. 2000. George Ledyard Stebbins. Biographical Memoirs of the National Academy of Sciences 85:290-313 Raven, P. H. 2000. "G. Ledyard Stebbins (1906–2000): An appreciation". Proceedings of the National Academy of Sciences 97:6945-6946 1950 non-fiction books Books about evolution Botany books Columbia University Press books Modern synthesis (20th century)