Flora Costaricensis / William Burger, editor.

v.40(1977)

Flora of Guatemala / Dorothy L. Nash, Louis O. Williams ; genera contributed by Kenneth M. Becker ... [et al.].

v.24:pt.12(1976)

Flora of Guatemala / Paul C. Standley and Louis O. Williams.

v.24:pt.7:no.4(1963)

Contributions to the flora of Venezuela / [Julian A. Steyermark and collaborators].

v.28:no.1(1951)

New species in the palm genus Syagrus Mart., II / [by] S.F. Glassman.

v.31:no.13(1968)

Revision of the genus Vascellum (Lycoperdaceae).

v.32:no.9(1970)

Tropical American plants, VII / Louis O. Williams.

v.31:no.6(1965)

Orchids of Peru / Charles Schweinfurth.

v.30:no.3(1960)

Flora of Guatemala / Paul C. Standley and Louis O. Williams.

v.24:pt.7:no.2(1962)

A revision of Cedrela (Meliaceae)

v.29:no.5(1960)

Flora of Guatemala / Paul C. Standley and Julian A. Steyermark.

v.24:pt.6(1949)

Studies in American plants, II / Dorothy N. Gibson.

v.32:no.11(1970)

Flora of Guatemala.

v.24:pt.7:no.3(1963)

Contributions to the flora of South America: Studies on Andean Compositae, II. Studies in South American plants, III.

v.27:no.2(1951)

Studies in the palm genus Syagrus Mart. [by] Sidney F. Glassman.

v.31:no.17(1968)