Einstein, H.H. (1991). Observation, quantification, and judgment: Terzaghi and engineering geology. Geotechnical Engineering, 117 (11), 1772-1778. doi:10.1061/0733-9410(1991)117:11(1772)
Einstein, H.H. (1991). Observation, quantification, and judgment: Terzaghi and engineering geology. Geotechnical Engineering, 117 (11), 1772-1778. doi:10.1061/0733-9410(1991)117:11(1772)