Orchids of Peru.
Chicago: Chicago Natural History Museum, 1958-1970. Octavo, text illustrations. Publisher's printed wrappers, with separately issued title page.
Fieldiana: Botany, Volume 30, numbers one to four and first supplement.
Chicago: Chicago Natural History Museum, 1958-1970. Octavo, text illustrations. Publisher's printed wrappers, with separately issued title page.
Fieldiana: Botany, Volume 30, numbers one to four and first supplement.