Papers on evolution, selected by Paul R. Ehrlich, Richard W. Holm and Peter H. RavenPaul R. Ehrlich, Richard W. Holm, Peter H. Raven · First published 1968Open the Tome
The American species of Sarcostemma R. Br. (Asclepiadaceae)Richard W. Holm, Washington University (Saint Louis, Mo.). · First published 1950Open the Tome
