Spradley, L. H. (1994). Surveying and navigation for geophysical exploration. International Human Resources Development Corporation.
Chicago-tyylinen lähdeviittausSpradley, L. Harold. Surveying and Navigation for Geophysical Exploration. Boston: International Human Resources Development Corporation, 1994.
MLA-viiteSpradley, L. Harold. Surveying and Navigation for Geophysical Exploration. International Human Resources Development Corporation, 1994.
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