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

v.24:pt.9:no.3-4(1973)

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

v.24:pt.7:no.1(1961)

Monograph of the genus Russelia (Scrophulariaceae)

v.29:no.4(1957)

Contributions to the flora of Venezuela : from Ericaceae through Compositae / Julian A. Steyermark and collaborators.

v.28:no.3(1953)

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)

Revision of the genus Vascellum (Lycoperdaceae).

v.32:no.9(1970)

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)

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)

A taxonomic revision of the genus Cnemidaria (Cyatheaceae) / Robert G. Stolze.

v. 37(1974)