Rayleigh wave assessment of damage and integrity of mine structures /
by Michael J. Friedel and Richard E. Thill.
- Washington, DC (2401 E St. NW, Washington 20241-0001) : U.S. Dept. of the Interior, Bureau of Mines, [1991]
- 12 p. : ill. ; 28 cm.
- Report of investigations ; 9389 .
- Report of investigations (United States. Bureau of Mines) ; 9389. .