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Civil War Artillery: Basic Facts Concerning Artillery
Site has information on the different types of artillery that were used in the Civil War.
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Civil War Artillery: Civil War Artillery Projectiles and Cannons
Site includes a wealth of information on the artillery of the civil war. There are sound clips, many pictures, text, and a large and illustrated glossary of terms. Information can be accessed using the navigation bar on the left.
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Florida Reenactors Online News Magazine: The Mountain Howitzer
A description of the the mountain howitzer and its use by both the Union and Confederate armies. Good pictures and interesting factoids too.