Cecil county - Maryland Geological Survey.; Bascom, F. (Florence),; Bauer, L. A. (Louis Agricola),; Bonsteel, Jay A. (Jay Allan),; Curran, Hugh McCollum,; Dorsey, Clarence Wilbur,; Fassig, Oliver Lanard,; Mathews, Edward Bennett,; Pressey, Henry Albert,; Shattuck, George Burbank,; Sudworth, George B. (George Bishop),; Sudworth, George B. (George Bishop),; et al. (Baltimore, The Johns Hopkins Press, 1902, 1902)
https://www.biodiversitylibrary.org/bibliography/61344
Keywords: Cecil county|Cecil County (Md.)|Geology|Maryland|