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• An Obituary Notice of Franklin Peale (Patterson, Robert )

• An Obituary Notice of William E. DuBois (Patterson, Robert )

• Observations on the commerce of the American states : with an appendix, containing an account of all rice, indigo, cochineal, tobacco, sugar, molasses, and rum imported into and exported from Great-Britain the last ten years, of the value of all merchandize imported into and exported from England, of the imports and exports of Philadelphia, New-York, &c. : also, an account of the shipping employed in America previous to the war (Sheffield, John Holroyd)

• Observations on the Practice of Counterfeiting Coins and Medals (Low, Lyman Haynes )

• Observations Sur Quelques Médailles Du Cabinet De M. Pellerin (Le Blond, Abbé)

• Observations upon the Method of Bank Note Manufacture (Bennett, Lyman)

• The Obsolete Bank Notes of New England (Wismer, David Cassel )

• Obsolete Bank Notes Of Ohio (Wismer, David Cassel )

• Obsolete Banknotes and Early Scrip of Michigan (Bowen, Harold L. )

• Obsolete Banknotes of New York (Wismer, David Cassel )

• Obsolete Banknotes of North Carolina (Pennell, James Roy )

• Obsolete Banknotes of Ohio (Wismer, David Cassel )

• Obsolete Banknotes of Pennsylvania (Wismer, David Cassel )

• Obsolete Fractional Coinage of the United States (Andersen, Paul )

• Obsolete Notes and Scrip of Rhode Island and the Providence Plantations (Roger H. Durand, Society of Paper Money Collectors, Inc.)

• Obsolete Paper Money Issued By Banks in the United States 1782-1866 (Bowers, Q(uentin) David )

• The Obsolete Paper Money of Virginia: Vol. 1 (Virginia Numismatic Association)

• The Obsolete Paper Money of Virginia: Vol. 2 (Virginia Numismatic Association)

• Odd & Curious And Traditional Money (Charles Opitz)

• Odd and Curious (Reed, Fred Morton )

• Odd and Curious Money of the World: A Complete Register (Gibbs, Howard)

• Odd and Curious Money: Descriptions and Values (Opitz, Charles J.)

• The Official 1966 Black Book of United States Coins (The House of Coins)

• The Official 1976 Black Book of United States Coins (Milton Dinkin, Irwin Cohen, Robert Morton)

• The Official 1978 Black Book of United States Coins, 15th Edition (The House of Collectibles Inc.)

• The Official 1979 Black Book Price Guide of United States Paper Money, 11th Edition (Kemm, Theodore S.)

• The Official 1981 Black Book Price Guide of United States Paper Money (Hudgeons, Marc)

• The Official 1983 Black Book Price Guide of United States Paper Money (Hudgeons, Marc)

• The Official 1986 Black Book Price Guide of United States Paper Money, 18th Edition (Hudgeons, Marc)

• The Official Black Book of United States Coins (1974) (Milton Dinkin, Irwin Cohen, Robert Morton)

• The Official Guide of United States Paper Money (Kemm, Theodore S.)

• Official Guide To Confederate Money (Criswell, Grover Cleveland )

• The Official Guide to Confederate Money & Civil War Tokens (Criswell, Grover Cleveland )

• Official Guide to Detecting Altered & Counterfeit U.S. Coins & Currency (Hudgeons, Marc)

• The Official Guide to Mint Errors (Herbert, Alan )

• Official Misconduct of Franklin Peale, Esq., Chief Coiner of the Mint (McCulloh, Richard Sears )

• The Official Price Guide to Mint Errors and Varieties (Herbert, Alan )

• Official Publication of the California Heritage Council (California Heritage Council)

• Old and New Style Fixed Dates Calendars (Baker, John R)

• Old colonial currencies [microform] (Dawson, Samuel Edward)

• On Monies, Coins, Weights, and Measures, Proposed for the United States of America (Bordley, John Beale)

• ON THE CHRONOLOGICAL SEQUENCE OF THE COINS OF BOEOTIA (Head, Barclay Vincent )

• On the Scarcity of the Copper Coin (Leslie, Charles)

• Once Upon a Dime (Federal Reserve Bank of New York)

• One currency for the empire [microform] (Shortt, Adam)

• One Fatt Calfe (Skipton, Amy)

• Opinion, analysis and exhibits of John J. Ford, Jr., expert witness on behalf of Thomas Ryan, sustaining genuineness : typescript. (Ford, John J. )

• Opinions delivered by the judges of the Court of Appeals on the constitutionality of the Act of Congress declaring treasury notes a legal tender for the payment of debts. (Davies, Henry Ebenezer)

• Orders and Directions for Conducting the Mint of the United States (Boudinot, Elias )

• Oriental numismatics : a catalog of the collection of books relating to the coinage of the East; presented to the Essex Institute, Salem, Massachusetts (Robinson, John)