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- Library of Congress Stamp468
- Penrose Public Library Stamp115
- Streeter, Thomas W. (Thomas Winthrop), 1883-1965 Ownership85
- Pikes Peak Library District Stamp64
- William H. Brown Collection60
- Hughes, Thomas Lowe, 1925- Ownership50
- Library of Congress. Map Division Stamp43
- Rodriguez, José M. Bookplate41
- Abbot, Charles, Baron Colchester, 1757-1829 Bookplate40
- Gates, Stephen F. Ownership35
- Streeter, Thomas W. (Thomas Winthrop), 1883-1965 Autograph31
- Rickard, Richard H., -1885 Ownership25
- Seymour, Charles, 1885-1963 Ownership25
- Mellon, Paul Bookplate24
- Washington, George, 1732-1799 Ownership23
- Karpinski, Louis Charles, 1878-1956 Ownership22
- Lanman, Jonathan T. Ownership21
- Pennsylvania Railroad. Real Estate Department Stamp21
- Pikes Peak Regional Library District Ownership21
- Library of Congress Ownership20