Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2003)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2003)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2003)

Index Kewensis. names of seed-bearing plants at the rank of family and below published between January 1991 and the end of 1995 with some omissions from earlier years Supplement twenty - Royal Botanic Gardens, Kew. (Royal Botanic Gardens, Kew)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1934)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 1973)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 1973)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 1973)