Floristics and paleofloristics of Asia and Eastern North America. Proceedings of symposia for the systematics section, 11th International Botanical Congress, Seattle, Wash. (U.S.A.), 1969, and the Japan-United States Cooperative Science Program, Corvallis, Oreg. (U.S.A.), 1969. Ed. by Alan Graham.
Floristics and paleofloristics of Asia and Eastern North America. Proceedings of symposia for the systematics section, 11th International Botanical Congress, Seattle, Wash. (U.S.A.), 1969, and the Japan-United States Cooperative Science Program, Corvallis, Oreg. (U.S.A.), 1969. Ed. by Alan Graham.