Samuel Finley Breese Morse and The Telegraph – Audiobook: Samuel Finley Breese Morse and the Telegraph: Revolutionizing Communication by Rupert Sargent Holland

Thomas Alva Edison and The Electric Light – Audiobook: Thomas Alva Edison and the Electric Light: Illuminating the World by Rupert Sargent Holland

Cyrus H. Mccormick and The Reaper – Audiobook: Cyrus H. McCormick and the Reaper: Transforming Agriculture by Rupert Sargent Holland

Robert Fulton and The Steamboat – Audiobook: Robert Fulton and the Steamboat: Revolutionizing Water Transportation by Rupert Sargent Holland