The World of Dante, Parker, Deborah (Editor) sponsored by the Institute for Advanced Technologies in the Humanities, University of Virginia
Map of Dante's Hell, Columbia College, New York, New York
Dante's Divine Comedy in Italian (search, Dante), Bodleian Library, Oxford University
The Fiske Dante Collection, Cornell University Library, Rare and Manuscript Collections
La Commedia.Divina commedia, Florence, Nicolaus Laurentii, Alamanus, 30 Aug. 1481.[372] leaves, Library of Congress, Rare Books and Special Collections Division
The comedy of Dante Alighieri of Florence commonly called the Divine comedy : a line-for-line translation in the rime-form of the original by Melville Best Anderson, Stanford University Libraries, Special Collections, Stanford, California
The Brescia Dante : with a leaf from the illustrated edition of 1487 printed by Boninus de Boninis : and two essays, Dante Alighieri, universal poet, UWM Libraries Special Collections, (Digital Exhibits), Milwaukee, Wisconsin also, at APU Rare Books PQ4302 .A873 B74 1975 published by Salt Lake City: Brigham Young University, 1975).
Dante's Werke, Dante Alighieri, Albert Ritter (Hrsg) (scan from original book) Public Domain. " Albert Ritter sketched the Comedy's geography from Dante's Cantos: Hell's entrance is near Florence with the circles descending to Earth's centre; sketch 5 reflects Canto 34's inversion as Dante passes down, and thereby up to Mount Purgatory's shores in the southern hemisphere, where he passes to the first sphere of Heaven at the top."
"By Antonio Manetti di Tuccio Manetti - Cornell University: Persuasive Cartography, The PJ Mode CollectionBenivieni, Girolamo. Dialogo di Antonio Manetti: Cittadino fiorentino circa al sito, forma, & misure del lo infero di Dante Alighieri poeta excellentissimo. Florence: F. di Giunta. Manetti's work was published in 1506 with an edition of the Divine Comedy; the copy in the collection is from a separate edition, undated, which "may be of about 1520." Gilbert 1945, 289 n. 3. Public Domain."