- Crutchfield, D. M. 1976a. Six months response after mild paraquat treatment of loblolly pine [abstract]. Page 118 in M. H. Esser (ed.), Proceedings of the annual meeting of the Lightwood Research Coordinating Council, 20-21 January, Jacksonville, Florida. United States Department of Agriculture, Forest Service, Southeastern Forest Research Station. 154 p.
- Crutchfield, D. M. 1976b. Summary of Westvaco's field experiments with paraquat [abstract]. Page 48 in M. H. Esser (ed.), Proceedings of the annual meeting of the Lightwood Research Coordinating Council, 20- 21 January, Jacksonville, Florida. United States Department of Agriculture, Forest Service, Southeastern Forest Research Station. 154 p.