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» Excerpts from the Commentary on Peter of Spain's Tractatus
   Selections from this secondary work by Simon of Faversham, translated by John Longeway.
   http://uwp.edu/~longeway/peterspa.htm

» Peter of Spain (Petrus Hispanus)
   Life and work of 13th century logician and author of the Tractatus; from the Stanford Encyclopedia by Joke Spruyt.
   http://plato.stanford.edu/entries/peter-spain/