Found occurrences of John P. O'Brien in 2 documents in the collection. Click on a column heading to sort by it, or to toggle ascending or descending sorting for the current column:

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Alfred Roman, The military operations of General Beauregard in the war between the states, 1861 to 1865 2 0 Browse all entities in this document
Rev. James K. Ewer , Company 3, Third Mass. Cav., Roster of the Third Massachusetts Cavalry Regiment in the war for the Union 2 0 Browse all entities in this document