U.S. Coast and Geodetic Survey. (1945). Spokane (X-2) sectional aeronautical chart. U. S. Coast and Geodetic Survey.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रU.S. Coast and Geodetic Survey. Spokane (X-2) Sectional Aeronautical Chart. Washington, D.C.: U. S. Coast and Geodetic Survey, 1945.
एमएलए (8वां संस्करण) प्रशस्ति पत्रU.S. Coast and Geodetic Survey. Spokane (X-2) Sectional Aeronautical Chart. U. S. Coast and Geodetic Survey, 1945.
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