Higher-quality book covers version of Earth in Upheaval added November 11th, 2021The Velikovsky Encyclopediahttps://www.velikovsky.infoThe Immanuel Velikovsky Archive http://varchive.org/index.htmWorlds in Collision by Immanuel Velikovsky (1950)Earth in Upheaval by Immanuel Velikovsky (1955)Velikovsky Reconsidered by the Editors of Pensée (1966, 1976)The Age of Velikovsky by C. J. Ransom (1976)Stargazers and Gravediggers: Memoirs to Worlds in Collision by Immanuel Velikovsky (1983)The Velikovsky Affair by Alfred de Grazia (Editor), Ralph Juergens et al. (1978)The Velikovsky Heresies: Worlds in Collision and Ancient Catastrophes Revisited by Laird Scranton (2012)