- Theocritus Bion and Moschus Rendered into English Prose (English) by Theocritus
- Theocritus, translated into English Verse (English) by Theocritus
- Theodicy - Essays on the Goodness of God, the Freedom of Man and the Origin of Evil (English) by Farrer, Austin
- Theodicy - Essays on the Goodness of God, the Freedom of Man and the Origin of Evil (English) by Huggard, E.M.
- Theodicy - Essays on the Goodness of God, the Freedom of Man and the Origin of Evil (English) by Leibniz, Gottfried Wilhelm, Freiherr von
- Theodore Roosevelt (English) by Pearson, Edmund Lester
- Theodore Roosevelt; an Autobiography (English) by Roosevelt, Theodore
- Theodore Roosevelt and His Times (English) by Howland, Harold Jacobs
- Theodore Roosevelt; an Intimate Biography (English) by Thayer, William Roscoe
- The old Santa Fe trail - The Story of a Great Highway (English) by Inman, Henry
- Theological Essays and Other Papers — Volume 1 (English) by De Quincey, Thomas
- Theological Essays and Other Papers — Volume 2 (English) by De Quincey, Thomas
- The Theological Tractates and The Consolation of Philosophy (English) by Boethius, Anicius Manlius Severinus
- The Theological Tractates and The Consolation of Philosophy (Latin) by Boethius, Anicius Manlius Severinus
- Theologico-Political Treatise — Part 1 (English) by Elwes, R. H. M. (Robert Harvey Monro)
- Theologico-Political Treatise — Part 1 (English) by Spinoza, Benedictus de
- Theologico-Political Treatise — Part 2 (English) by Elwes, R. H. M. (Robert Harvey Monro)
- Theologico-Political Treatise — Part 2 (English) by Spinoza, Benedictus de
- Theologico-Political Treatise — Part 3 (English) by Elwes, R. H. M. (Robert Harvey Monro)
- Theologico-Political Treatise — Part 3 (English) by Spinoza, Benedictus de
- Theologico-Political Treatise — Part 4 (English) by Elwes, R. H. M. (Robert Harvey Monro)
- Theologico-Political Treatise — Part 4 (English) by Spinoza, Benedictus de
- The Theology of Holiness (English) by Clark, Dougan
- Theory of Circulation by Respiration - Synopsis of its Principles and History (English) by Willard, Emma
- The Theory of Numbers (English) by Carmichael, Robert D.
- Theory of Silk Weaving - A Treatise on the Construction and Application of Weaves, and the Decomposition and Calculation of Broad and Narrow, Plain, Novelty and Jacquard Silk Fabrics (English) by Wolfensberger, Arnold
- The Theory of Social Revolutions (English) by Adams, Brooks
- Theory of the Earth, Volume 1 (of 4) (English) by Hutton, James
- Theory of the Earth, Volume 2 (of 4) (English) by Hutton, James
- Theory of the Leisure Class (English) by Veblen, Thorstein
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