Denver Botanic Gardens Artifact and Memorabilia Collection, HFLA 008. Denver Botanic Gardens, Helen Fowler Library Archives.
Denver Botanic Gardens Artifact and Memorabilia Collection, HFLA 008. Denver Botanic Gardens, Helen Fowler Library Archives. https://archives.botanicgardens.org/repositories/2/resources/8 Accessed March 26, 2023.
