Heckler & Koch PSG1 (English Wikipedia)

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vojska.me

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web.archive.org

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worldcat.org

O'Brien, Paul; Fitzgerald, Wayne (2020). Shadow warriors : the Irish Army Ranger Wing. Cork. ISBN 978-1-78117-763-1. OCLC 1152255624.{{cite book}}: CS1 maint: location missing publisher (link)