A pane of fifty 20-cent commemorative stamps featuring the official birds and flowers of the fifty states in the United States was issued April 14, 1982, in Washington, DC. Handstamp pictorial cancellations were available in each state capital.
The designers of the stamps were Arthur and Alan Singer of Jericho, New York, and the modeler was Peter Cocci. The stamps were printed in the photogravure process, with fifty stamps per pane.
Postal Bulletin (March 11, 1982).