Ellwood, E., & Dale, F. (1957). Tests on the development of clean preservative treatments for crossarms (Progress report no.1) Oil treatments. Forest Products Laboratory.

Ellwood, E.L, and F.A Dale. Tests on the Development of Clean Preservative Treatments for Crossarms (Progress Report No.1) Oil Treatments. Australlia: Forest Products Laboratory, 1957.

Ellwood, E.L, and F.A Dale. Tests on the Development of Clean Preservative Treatments for Crossarms (Progress Report No.1) Oil Treatments. Forest Products Laboratory, 1957.