Umadhay, G. (1953). Theory and practice of plane-table surveying.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUmadhay, Gregorio. Theory and Practice of Plane-table Surveying. 1953.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUmadhay, Gregorio. Theory and Practice of Plane-table Surveying. 1953.
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