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Image of WWI: GAS MASK, 1918. - American Soldier Showing A Type Of Gas Mask. Photograph, 1918. From Granger - Historical Picture Archive
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Arbeiten_zur_inneren_Ausrustung_der_Gasmasken_-_CH-BAR_-_3241297-gas-mask -factory-Switzerland-WW1 - Vivian Lawry
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