1970. George Washington Carver. Washington: Smithsonian Institution Press. 12 pages, illustrated.

1971. "Indigo in Carolina, 1671-1796." The South Carolina Historical Magazine, 72 (April, 1971):94-103.

1971. "The Indigo Bonanza in South Carolina, 1740-90." Technology and Culture, 12 (July 1971): 447-455.

Summons, Terry G.

1968. "Animal Feed Additives, 1940-1966." Agricultural History, 42 (October 1968): 305-313.

Wessel, Thomas R.

1967. "Prologue to the Shelterbelt, 1870-1934." Journal of the West, 6 (January 1967): 119-134. Illustrated.

1967. The Honey Bee. Smithsonian Institution, Information Leaflet 482. 16 pages, illustrated. [Revised 1968.]

1969. "Roosevelt and the Great Plains Shelterbelt." Great Plains Journal, 8 (Spring 1969): 57-74.

1970. "Agriculture and Iroquois Hegemony in New York, 1610-1779." Maryland Historian, 1 (Fall 1970): 93-104.