Evaluation of Certain Factors Affecting the Yield of Cacao in EcuadorRobert L. Fowler, Russell Desrosiers, Henry Hopp · First published 1956Open the Tome
Some experimental designs useful for exploratory research in underdeveloped areasHenry Hopp · First published 1952Open the Tome
Methods of distinguishing between the shipmast and common forms of black locust on Long Island, N.YHenry Hopp · First published 1941Open the Tome
