Bibliography of cultivated trees and shrubs hardy in the cooler temperate regions of the Northern Hemisphere - Rehder, Alfred, 1863 -1949 (Arnold Arboretum of Harvard Univ, 1949)

[Price list]. Nr. 20 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (A. Grünwald, 1931)

[Seed-list] September 1930 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (A. Grünwald, 1930)

[Seed-list] September 1934 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Grünwald & Co, 1934)

[Seed-list] September 1937. Nr. 6 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Grünwald & Co, 1937)