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References
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A Study of the U. S. Internal Revenues of 1861-70: F. E. Lawrence, Linn's Weekly Stamp News, Oct. 29, 1962.
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An Historical Reference List of the Revenue Stamps of the U. S.: Toppan, Deats and Holland, Boston Philatelic Society, 1899.
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Scott's United States Stamp Catalogue Specialized, 1965.