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2. Identification and Characterization of Collapsible Gravels;K M Rollins;J. Geotech. Eng,1994
3. Identification, characterization, and mapping of collapsible soils in southwestern Utah;K M Rollins;Geol. Southwest. Utah Utah Geol. Assoc. Salt Lake City Utah,1992
4. The collapse mechanism in partly saturated soil;L Barden;Eng. Geol,1973