Title: All aboard the Discovery Express
Description: Welcome on board the Discovery Express! The year is 1937 and a conundrum is afoot: a professor on the verge of a brilliant discovery has disappeared. Can you help to solve the clues on this time-travelling adventure and track down the missing scientist?
Subjects: Railroads, Juvenile literature, History, Railroads, history, Railroads, juvenile literature, Toy and movable books