Book Baum, Richard (2007)
Haunted Observatory: Curiosities from the Astronomer's Cabinet. (/isis/citation/CBB000830150/) unapi

Book Baum, Richard; Sheehan, William (1997)
In search of planet Vulcan: The ghost in Newton's clockwork. (/isis/citation/CBB000072419/) unapi

Article Baum, Richard (1996)
William Lassell and “the accident of a maid-servant's carelessness” or, Why Neptune was not searched for at Starfield. Journal of the British Astronomical Association (pp. 217-219). (/isis/citation/CBB000074370/) unapi

Article Sheehan, William; Baum, Richard (1995)
Observation and inference: Johann Hieronymous Schroeter, 1745-1816. Journal of the British Astronomical Association (pp. 171-175). (/isis/citation/CBB000067614/) unapi

Article Baum, Richard (1995)
Franz von Paula Gruithuisen and the discovery of the polar spots of Venus. Journal of the British Astronomical Association (pp. 144-147). (/isis/citation/CBB000067605/) unapi

Book Giordano Bruno: Tragik eines Unzeitgemässen (1993). (/isis/citation/CBB000031855/) unapi

Article Baum, Richard; Sheehan, William (1992)
G.D. Cassini and the rotation period of Venus: A common misconception. Journal for the History of Astronomy (pp. 299-301). (/isis/citation/CBB000041322/) unapi

Book Simon, Denis Fred; Goldman, Merle (1989)
Science and technology in post-Mao China. (/isis/citation/CBB000029948/) unapi

Article Smith, Robert W.; Baum, Richard (1984)
William Lassell and the ring of Neptune: A case study in instrument failure. Journal for the History of Astronomy (pp. 1-17). (/isis/citation/CBB000005135/) unapi

Book Baum, Richard (1980)
China's four modernizations: The new technological revolution. (/isis/citation/CBB001180567/) unapi