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MLA
Great Britain. War Office. General Staff. Geographical Section. (Cartographer). Europe (Air) 1:500,000. Series M404. [Bilbao, Sheet NW-42-6] - University of Texas Libraries Collections. 1940. https://collections.lib.utexas.edu/catalog/utlmaps:4aa9eae0-f4a6-4bd2-a84d-5f19d4d794f3APA
Great Britain. War Office. General Staff. Geographical Section. (Cartographer). (1940). Europe (Air) 1:500,000. Series M404. [Bilbao, Sheet NW-42-6]. Retrieved May 20, 2024, from https://collections.lib.utexas.edu/catalog/utlmaps:4aa9eae0-f4a6-4bd2-a84d-5f19d4d794f3Chicago
Great Britain. War Office. General Staff. Geographical Section. (Cartographer). Europe (Air) 1:500,000. Series M404. [Bilbao, Sheet NW-42-6]. 1940. "Europe (Air) 1:500,000. Series M404. [Bilbao, Sheet NW-42-6] – Collections". University of Texas Libraries Collections. <https://collections.lib.utexas.edu/catalog/utlmaps:4aa9eae0-f4a6-4bd2-a84d-5f19d4d794f3> (20-May-2024).Note that these citations have been automatically generated, please verify that citation is correct and contains all necessary information.