Pennsylvania. Department of Transportation, United States. Environmental Protection Agency, Anderson, J. A., & Gesford, A. L. (2007). Environmentally sensitive maintenance for dirt and gravel roads: A manual to provide guidance using natural systems and innovative technologies to reduce erosion, sediment and dust pollution while more effectively and efficiently maintaining dirt and gravel roads (Reissue ver: 1.1.). U.S. Environmental Protection Agency.
Chicago Style (17th ed.) CitationPennsylvania. Department of Transportation, United States. Environmental Protection Agency, John A. Anderson, and Alan L. Gesford. Environmentally Sensitive Maintenance for Dirt and Gravel Roads: A Manual to Provide Guidance Using Natural Systems and Innovative Technologies to Reduce Erosion, Sediment and Dust Pollution While More Effectively and Efficiently Maintaining Dirt and Gravel Roads. Reissue ver: 1.1. [Washington, D.C.]: U.S. Environmental Protection Agency, 2007.
MLA (9th ed.) CitationPennsylvania. Department of Transportation, et al. Environmentally Sensitive Maintenance for Dirt and Gravel Roads: A Manual to Provide Guidance Using Natural Systems and Innovative Technologies to Reduce Erosion, Sediment and Dust Pollution While More Effectively and Efficiently Maintaining Dirt and Gravel Roads. Reissue ver: 1.1. U.S. Environmental Protection Agency, 2007.