
The Mathematics of Magic was probably the greatest discovery of the ages - at least Professor Harold Shea thought so. With the proper equations, he could instantly transport himself back in time to all the wondrous lands of ancient legend.
But slips in time were a hazard, and Shea's magic did not always work - at least, not quite as he expected . . .
This omnibus volume of all of the Magical Misadventures of Harold Shea contains The Incomplete Enchanter, The Wall of Serpents and Castle of Iron
Lyon Sprague de Camp — known as L. Sprague de Camp — was an American writer of science fiction, fantasy, non-fiction and biography. In a career spanning 60 years, he wrote over 100 books, including novels and works of non-fiction, including biographies of other fantasy authors. - Wikipedia

by Lyon Sprague De Camp, Fletcher Pratt
The Mathematics of Magic was probably the greatest discovery of the ages - at least Professor Harold Shea thought so. With the proper equations, he could instantly transport himself back in time to all the wondrous lands of ancient legend.
But slips in time were a hazard, and Shea's magic did not always work - at least, not quite as he expected . . .
This omnibus volume of all of the Magical Misadventures of Harold Shea contains The Incomplete Enchanter, The Wall of Serpents and Castle of Iron
Lyon Sprague de Camp — known as L. Sprague de Camp — was an American writer of science fiction, fantasy, non-fiction and biography. In a career spanning 60 years, he wrote over 100 books, including novels and works of non-fiction, including biographies of other fantasy authors. - Wikipedia