Email Record: Strategies of plant reproduction : invited papers presented at a symposium held May 17-20, 1981, at the Beltsville Agricultural Research Center (BARC), Beltsville, Maryland / Werner J. Meudt, editor ; organized by the BARC Symposium VI Committee, Albert A. Piringer, chairman ; sponsored by the Beltsville Agricultural Research Center, Northeastern Region, Agricultural Research Service, United States Dept. of Agriculture.