Correspondence is primarily related to inquiries regarding weeds and plant diseases in Iowa, but also includes requests from other states and international inquiries. Material and pamphlets related to wildlife, farm safety, and weed control are in the collection as well. Among the manuscripts is a draft of Louis H. Pammel's weed survey of Iowa, which Sylwester co-edited. Other manuscripts related to weed control written by Sylwester are in the collection. Much of the material is ephemera collected by Sylwester related to botany and natural sciences.
Collection also includes sound recordings related to weed control.
Sketch - E.P. Sylwester n.d. On Weed Control n.d. The Control of Dandelions in Lawns n.d. Midwest Agricultural Chemicals Assn. Livestock Hazards n.d.