Collins, Thomas K; Hicks, Billie G; Stockdale, Thomas W; Butts, George F. 1972. Engineering Field Notes: Volume 4 Numbers 9 and 10 September -- October 1972. 7271 3805. Washington DC: U.S. Department of Agriculture, Forest Service, Engineering. 18 p.

Topics in this issue include:

• Engineering Geology in a Massively Unstable Region
• Classification of Crankcase Oils
• Preservation of Tree Land Corners

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