Violets of North America [with] Some Natural Violet Hybrids of North America

172; 203 pp. Marbled endpapers. Two bulletins bound together in one volume. Color plates. Violets of North America (University of Vermont and State Agricultural College, Vermont Agricultural Experiment Station, Burlington, Vermont, December, 1921, Bulletin 224.) Some Natural Violet Hybrids of North America (University of Vermont and State Agricultural College, Vermont Agricultural Experiment Station, Burlington, Vermont, July, 1924, Bulletin 239.)