Keen, J. E. (1994). Land surveyor's formulas with applications. North Carolina: Land Surveyor's Workshops.
Chicago Stili AlıntıKeen, John E. Land Surveyor's Formulas With Applications. North Carolina: Land Surveyor's Workshops, 1994.
MLA AlıntıKeen, John E. Land Surveyor's Formulas With Applications. North Carolina: Land Surveyor's Workshops, 1994.
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