Proceedings from Symposium II & Lectures, North American Terrestrial Orchids - Plaxton, Elmer H. (Michigan Orchid Society, 1983)
"Presented by Michigan Orchid Society, host for the American Orchid Society & Mid-America congress meetings, Southfield, Michigan"–Otro título tomado de la cubierta: North American Terrestrial Orchids : proceedings from Symposium II and Lectures