00723cam a2200229 4500 91643118 TxAuBib 19770629120000.0 700404s1969||||||||||||||||||||||||eng|u 74086693 (OCoLC)62572 DLC DLC DLC TxAuBib Dixon, Franklin W. The secret panel / by Franklin W. Dixon. New York : Grosset & Dunlap, [1969] 178 p. : illus ; 20 cm. His Hardy boys mystery stories, 25 19770629. Mystery and detective stories. His Hardy boys mystery stories, 25. TXTLL