(en) Daniel L. Leedy, Thomas M. Franklin et Robert M. Maestro, Planning for Urban Fishing and Waterfront Recreation, U.S. Department of the Interior, Fish and Wildlife Service, Eastern Energy and Land Use Team, (lire en ligne)
Soil Survey Division Staff, Soil survey manual, United States Department of Agriculture, , 63–65 p. (lire en ligne)
soils.usda.gov
« Particle Size (618.43) » [archive du ], National Soil Survey Handbook Part 618 (42-55) Soil Properties and Qualities, United States Department of Agriculture - Natural Resource Conservation Service (consulté le )
« Particle Size (618.43) » [archive du ], National Soil Survey Handbook Part 618 (42-55) Soil Properties and Qualities, United States Department of Agriculture - Natural Resource Conservation Service (consulté le )