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The Summa Logicae (Latin, in English it's the Sum of Logic) is a textbook on logic by William of Ockham. There are articles about the Summa Logicae in Wikipedia and in Logicmuseum.

It was published in Paris in 1488. There are different typed variants of this textbook, for example here (in English).

But I can't find any scans or photos of the original handmade manuscript or the original (first) edition. Do you know any links or libraries or museims, where I can find it?

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closed as off topic by JSBձոգչ, Dale Hartley Emery, Neil Fein May 7 '13 at 23:58

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Yale Digital Content reports that it holds:

William of Ockham, Summa Logicae, etc. General Collection, Beinecke Rare Book and Manuscript Library, Yale University.

Manuscript on paper (thick, coarse, some deckle edges; watermarks indistinguishable) of William of Ockham, Summa logicae. With Walter Burley, De puritate artis logicae tractatus brevior, beginning of text only.

Creator: William, of Ockham, ca. 1285-ca. 1349.
Publisher: Italy,
Publication Date: [between 1400 and 1450]
Type: Archives or manuscripts
Physical Description: ff. i + 125 + i: paper ; 222 x 145 (195 x 110) mm.

Note that it is desribed as Written by a single scribe in small, cramped and highly abbreviated gothic cursive, so it is presumably not a "first edition". But given that it apparently predates your date for first publication (1488?), it may be useful.

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