Dixon, Franklin W. The jungle pyramid / [book] - New York : Grosset & Dunlap, c1977. - 180 p. : ill. ; 20 cm. - His The Hardy boys mystery stories ; 56 . ISBN: 0448089564. 0448189569 $2.50 LCCN: 76014297 /AC Nat. Bib. Agency Control No.: 780194144 Dewey Class. No.: C813/.54