| United States |
| 1847 Issue (21) |
| 1851 Issue (17) |
| 1857 Issue (30) |
| 1861-1866 Issue (20) |
| 1861-1866 Issue, 1c Blue (8) |
| 1861-1866 Issue, 1c Blue (Cancels - Balance Lots) (14) |
| 1861-1866 Issue, 1c Blue (Cancels) (62) |
| 1861-1866 Issue, 1c Blue (Shades) (3) |
| 1861-1866 Issue, 3c-24c Issues (15) |
| 1867 Grilled Issues (9) |
| 1867 Grilled Issues, 1c Blue, F. Grill (3) |
| 1867 Grilled Issues, 1c Blue, F. Grill (Cancels) (8) |
| 1869 Pictorial Issue (30) |
| 1870-1881 Bank Note Issues (49) |
| 1870-1888 Bank Note Issues (15) |
| 1875 Re-issue of the 1861-1866 Issues (1) |
| 1875 Re-issue of the 1869 Pictorial Issue (1) |
| 1875 Reprints of the 1857 Issue (1) |
| 1890 Issue (2) |
| 1893 Columbian Issue (21) |
| 1894-1898 Bureau Issues (6) |
| 1895-1898 Bureau Issues (3) |
| 1898 Trans-Mississippi Issue (12) |
| 1901 Pan-American Issue (7) |
| 1902-1908 Regular Issues (14) |
| 1904 Louisiana Purchase Issue (2) |
| 1908-1910 Washington-Franklin Issues (6) |
| 1912-1919 Washington-Franklin Issues (12) |
| 1913-1915 Panama-Pacific Issue (1) |
| 1918-1923 Issues (5) |
| 1922-1925 Regular Issue (5) |
| 1925-1979 Issues (24) |
| 20th Century Issues (19) |
| Advertising & Illustrated Covers (26) |
| Advertising/Illustrated Covers (2) |
| Airmail Issues (23) |
| Albania to Liberia (1) |
| Back of the Book Covers (4) |
| Back of the Book Issues (9) |
| California Balance Lots (5) |
| California Documents and Illustrated Covers (11) |
| California Postal History (28) |
| Canal Zone (7) |
| Carrier & Local Usages (7) |
| Civil War Postal History |
| Postal History (9) |
| United States Patriotic Covers (17) |
| Confederate Expresses (2) |
| Confederate States of America & Possessions (4) |
| Eastern Express Covers (9) |
| Errors, Freaks and Oddities - Back of the Book Iss (6) |
| Errors, Freaks and Oddities - Groups and Balance L (16) |
| Errors, Freaks and Oddities 1957-1974 (30) |
| Errors, Freaks and Oddities 1975-1985 (25) |
| Errors, Freaks and Oddities 1986-1995 (17) |
| Event covers (2) |
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| Foreign Mail Balance Lots (7) |
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| Foreign Mails - 1848 (21) |
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| Foreign Mails - 1861 to 1863 (6) |
| Foreign Mails - 1864 to 1867 (4) |
| Foreign Mails - 1868 to 1875 (4) |
| Freight Money Letters (6) |
| Gun Covers - Allen & Jemison to Oriental Smokeless (19) |
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| Hawaii - Postal History (9) |
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| Machine Cancels (5) |
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| New York Foreign Mail Cancels - on Cover (4) |
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| Postal History Arranged by State (26) |
| Postal History by State - Connecticut to New Mexic (9) |
| Postal History by State - New York to Vermont (11) |
| Postal Stationery Issues (7) |
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| Regular Issues (61) |
| Regular Issues on Cover (16) |
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| Special Delivery Issues (17) |
| State/Provincial Postmarks (19) |
| The Engert Collection of Colorado Postal History - (118) |
| The Nick Kirke Collection of New York Foreign Mail (85) |
| United States (15) |
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| Worldwide Collections (62) |