Any material regarding the Spanish Civil War 1…

Any material regarding the Spanish Civil War 1936-39? Please combat units, no politics or propaganda. Thanx in advance!

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Republican units in combat

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Republican units manning a vickers machine gun

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German communist volunteers for the Republican army

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Republican T-26 on the move

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Republican forces with a captured CV33 at the battle of Guadalajara

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Spanish Nationalist field gun crew at the Battle of Guadalajara, Spain, 1937

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A column of Spanish Nationalist troops at the Battle of Guadalajara, Spain, 1937 

43rd Division of the popular army on the march