4 blueprints of Western Approaches HQ, Derby House, Liverpool. Layout and pneumatic tubes for transmission of messages, 1940.

Blueprints of Western Approaches HQ, Derby House, Liverpool, 1940. | National Museums Liverpool

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Blueprints of Western Approaches HQ, Derby House, Liverpool, 1940.

https://www.liverpoolmuseums.org.uk/artifact/blueprints-of-western-approaches-hq-derby-house-liverpool-1940

http://content.liverpoolmuseums.org.uk/artifact/blueprints-of-western-approaches-hq-derby-house-liverpool-1940