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Books about Petaja:
Biography - Petaja, Emil (Theodore) (1915-2000): An article from: Contemporary Authors by Gale Reference Team (Dec 16, 2007)
Saga of lost earths; The Star Mill by Petaja, Emil by Emil Petaja (1000)
Crown of Infinity (backed with "The Prisim," by Emil Petaja) by John M. Faucette and Kelly Freas (1968)
Wiki information Petaja:
Emil Petaja was an American science fiction and fantasy writer whose career spanned seven decades. He was the author of 13 published novels, nearly 150 short stories, numerous poems, and a handful of books and articles on various subjects. Though he...
Tuuli Petaja is an athlete. He represented Finland in the 2012 Summer Olympics.