Cite
MLA Citation
Unknown. 42cm "big bertha" and german siege artillery of world war i. London : Osprey Pub, 2014. http://access.bl.uk/ark:/81055/vdc_100034415200.0x000001
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Unknown. 42cm "big bertha" and german siege artillery of world war i. London : Osprey Pub, 2014. http://access.bl.uk/ark:/81055/vdc_100034415200.0x000001