1. Method for crosshole seismic testing;Ballard;J. Geotech. Eng. Div. GT12 ASCE,1976
2. The hidden layer problem in seismic refraction work:;Banerjee;Geophys. Prospect.,1975
3. Experience with geophysics in New York State;Bird;Am. Soc. Testing Mater., Spec. Tech. Pub.,1952
4. A seismic survey determination of the thickness of unconsolidated deposits overlying shallow mine workings;Brown;Colliery Guardian,1953
5. Seismic techniques in exploration of quaternary deposits;Burke;Geoexploration,1973