Question: When was the first percy jackson book published?
Disambiguated questions and answers: question: When was the hardcover version of the first Percy Jackson book originally published in English?
When was the paperback version of the first Percy Jackson book originally published in English?
answer: July 1, 2005
April 1, 2006
Natural Questions answer: July 1 , 2005 (from the Wikipedia article "The Lightning Thief")