. Samuel Morse and the Electronic Age by Wilma Pitchford Hays, Immortals of Engineering
. Robert Boyle: Founder of Modern Chemistry by Harry Sootin, Immortals of Science
. Marco Polo: The Great Traveler by Robert N Webb, Immortals of History, Vintage 1967
. Alessandro Volta and the Electric Battery, Bern Dibner, Immortals of Science, 1964
