- Pseudo-Pythagoras.1
- Pythagoras.1
- Ratdolt, Erhard, 1447?-1527 or 81
- Reichskartause Buxheim Presentation inscription from Hilprand Brandenburg1
- Reynoldes, Thomas--Autograph.1
- Rosaccio, Giuseppe, approximately 1530-approximately 16201
- Rosenthal, Bernard M.--Ownership.1
- Ruscelli, Girolamo, -approximately 15651
- Simōnidēs, Kōnstantinos, approximately 1820-approximately 1867.1
- Soardi, Lazzaro de', ca. 1450-1517.1
- Strawberry Hill (Twickenham, London, England)1
- Syrianos.1
- Theodoret, Bishop of Cyrrhus.1
- Thomas, Isaiah,--1749-1831--Bookplate.1
- Thorne Collection of Cartogaphy and Geography Bookplate.1
- Torresano, Federico, d. 1561 or 62, publisher1
- Toussain, Jacques, d. 15471
- Tramezzino, Michele, -1579, printer.1
- Tyrtaeus.1
- Tzetzes, John, 12th cent.1
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