1. A. P. Annan, J. L. Davis, and C. J. Vaughan . 1984 . Radar mapping of buried pipes and cables. A-Cubed, Inc., Tech. Note 1. 17 pp.
2. L. F. Brown, and W. L. Fisher . 1980 . Seismic stratigraphie interpretation and petroleum exploration . AAPG Continuing Education Course Note Series #16. 56 pp.
3. RADAR TRANSPARENCIES OF MINE AND TUNNEL ROCKS
4. R. F. Flint, 1978 . The surficial geology of the Haddam quadrangle. Connecticut Geological and Natural History Survey quadrangle report 36. 27 pp. 1 sheet, scale 1:24,000.