Reference:Williams1983a
Verbatim text: Williams, J. G. and A. E. Williams. 1983. Field Guide to Orchids of North America. New York.
Author: Williams, J.G., Williams, A.E.
Year: 1983
Title: Field Guide to Orchids of North America
Verbatim text: Williams, J. G. and A. E. Williams. 1983. Field Guide to Orchids of North America. New York.
Author: Williams, J.G., Williams, A.E.
Year: 1983
Title: Field Guide to Orchids of North America