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Start Over Formats Still image ✖Remove constraint Formats: Still image Subjects United Kingdom ✖Remove constraint Subjects: United Kingdom Subjects Military Personnel ✖Remove constraint Subjects: Military Personnel Subjects Cooperative Behavior ✖Remove constraint Subjects: Cooperative Behavior Languages English ✖Remove constraint Languages: English Languages Russian ✖Remove constraint Languages: Russian Publication Year 1916 ✖Remove constraint Publication Year: 1916

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