New York: Bantam, (2003.) dj. Hardcover first edition - Historical novel based on an event in the life of Charles Babbage - "an English genius of legendary eccentricity. He invented the cowcatcher, the ophthalmoscope, and the 'penny post' . . . And all his life he was in desperate need of enormous sums of money to build his fabled reasoning machine, the Difference Engine, the first digital computer in history. To publicize his Engine, Babbage sponsors a private astronomical expedition - a party of four men and one remarkable woman - who will set out from Washington City and travel by wagon train two thousand miles west, beyond the last known outposts of civilization. Their ostensible purpose is to observe a total eclipse of the sun predicted by Babbage's computer, and to photograph it with the newly invented camera of Louis Daguerre." INSCRIBED by the author on the title page "For . .. . I hope you enjoy this fictional trip down the old Santa Fe Trail." 305 pp. ISBN: 0-553-802089.

Creston Books, (2015) dj. SIGNED hardcover first edition - The story of Ada Lovelace, the daughter of the poet, Lord Byron, develops her creativity through science and math - especially after a bout with the measles left her temporarily blind, and on crutches for years. At just 17, she met Charles Babbage, the inventor of the first mechanical computer, Ada understands the machine better than anyone else and writes the world's first computer program for his Analytical Engine. Although this device which was never built, so her program could not be tested then, it proved almost perfect when tested by modern computer scientists, and the computer language "Ada" was named for her. Illustrated in full color by April Chu and SIGNED by the illustrator on the title page. Includes an author's note, a brief timeline and bibliography. Large format, unpaginated. ISBN: 978-1939547200.