Estados Unidos Department of the Army Corps of Ingineers. (1970). Calibration of laboratory soils testing equipment: Engineering and desing. Washington, D.C.: Department of the Army U.S., Army Corps of Engineers.

Estados Unidos Department of the Army Corps of Ingineers. Calibration of Laboratory Soils Testing Equipment: Engineering and Desing. Washington, D.C.: Department of the Army U.S., Army Corps of Engineers, 1970.

Estados Unidos Department of the Army Corps of Ingineers. Calibration of Laboratory Soils Testing Equipment: Engineering and Desing. Washington, D.C.: Department of the Army U.S., Army Corps of Engineers, 1970.