1. Density and Moisture Content Measurements by Nuclear Methods;Ballard,1965
2. Density and Moisture Content Measurements by Nuclear Methods;Gardner,1967
3. The Effects of Type of Material on Nuclear Density Measurements;Kühn;Highway Research Record No. 66,1963
4. A Calibration Model for Optimizing the Air-Gap Method of Compensating Nuclear Density Gauges for Soil Composition Variations;Gardner;J. Materials,1967
5. Minimizing Errors in Gamma-Ray Surface-Type Density Gages: Existing Gages and New Design Concepts;Dunn;Highway Research Record No. 301,1970