The Overstreet Comic Book Price Guie (or Official Overstreet Comic Book Price Guide) is widely considered the primary authority on the subject of American comic book grading and collection values in the industry. Begun in 1970 by Bob Overstreet as a guide for fellow fans of Golden Age era comics, the Overstreet comic book price guide has since expanded to cover the entire history of the American comics publication. Its 38th edition was published by Gemstone Publishing in 2008.