Wikipedia, viewed July 29, 2009 (Geotechnical engineering; branch of civil engineering concerned with the engineering behavior of earth materials; used in designing earthworks, pavements, and structure foundations, etc.; related to earthquake engineering; related to coastal engineering; closely related to and overlapping with the field of engineering geology which is a specialty of geology)

McGraw-Hill concise encyclopedia of science and technology, 2009: v. 1, p. 865 (under Engineering geology; application of education and experience in geology and other geosciences to solve geological problems posed by civil engineering works ... another relevant term is geotechnics, the combination of pertinent geoscience elements with civil engineering elements to formulate the civil engineering system that has the optimal interaction with the natural environment)

EI compendex, viewed July 29, 2009 (thesaurus term: Geotechnical engineering; related to Civil engineering, Engineering geology, Mining engineering)