. . . "Book"@en . . . "The Secret of Skull Mountain (original text)"@en . "The Secret of Skull Mountain"@en . . . . . . . "212"^^ . . "__WIKIA_BANNER__ The Secret of Skull Mountain is the 27th book in The Hardy Boys series. It was first published in 1948 by Grosset & Dunlap."@en . . . . "1948"^^ . . . "__WIKIA_BANNER__ The Secret of Skull Mountain is the 27th book in The Hardy Boys series. It was first published in 1948 by Grosset & Dunlap."@en . . .