Northwest Regional Council. (1940). Pacific Northwest resources in outline.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorthwest Regional Council. Pacific Northwest Resources in Outline. Portland, Or, 1940.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNorthwest Regional Council. Pacific Northwest Resources in Outline. 1940.
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