The fern genus Diellia : its structure, affinities and taxonomy /

por Wagner, Warren Herbert 1920-2000
Publicado 1952

Pteridophytes of Costa Rica : preliminary checklist of species known to be or probably occurring in Costa Rica /

por Wagner, Warren Herbert 1920-2000
Publicado 1966

Biology of tropical pteridophytes /

Publicado 1967

Michigan trees : a guide to the trees of Michigan and the Great Lakes region /

por Barnes, Burton V.
Publicado 1981