Johnson, L. E. Geographic information systems in water resources engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Lynn E. Geographic Information Systems in Water Resources Engineering.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJohnson, Lynn E. Geographic Information Systems in Water Resources Engineering.
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