R. C. Roark

No biography available.

Works (8)

Cover of Lonchocarpus species (Barbasco, Cube, Haiari, Nekoe, and Timbo) used as insecticides

Lonchocarpus species (Barbasco, Cube, Haiari, Nekoe, and Timbo) used as insecticides

Cover of A bibliography of chloropicrin, 1932-1934

A bibliography of chloropicrin, 1932-1934

Cover of An index of patented mothproofing materials

An index of patented mothproofing materials

Cover of A bibliography of chloropicrin, 1848-1932

A bibliography of chloropicrin, 1848-1932

Cover of List of publications of the Division on Insecticide Investigations, July 1, 1927, to June 30, 1937

List of publications of the Division on Insecticide Investigations, July 1, 1927, to June 30, 1937

Cover of A digest of the literature of derris (deguelia) species used as insecticides, 1747-1931

A digest of the literature of derris (deguelia) species used as insecticides, 1747-1931

Cover of A second digest of information on allethrin and related compounds

A second digest of information on allethrin and related compounds

Cover of The adulteration of insect powder with powdered daisy flowers (Chrysanthemum leucanthemum L.)

The adulteration of insect powder with powdered daisy flowers (Chrysanthemum leucanthemum L.)