Robert Cook

THREE MORE PLANT PATENTSPlant Patents 2, 3, and 4 Issued—Patent Drawings in Color—Need for Type Plant Emphasized—Contrasts Between Mechanical and Botanical Inventions

Robert Cook, 1931 .

ZEBU-YAK HYBRIDSTHE FIRST PLANT PATENT

Robert Cook, 1931 .

The Population Reference Bureau

Robert Cook, R. Cook, 1953, Science.

OTHER PLANT PATENTS

Robert Cook, 1933 .