The Hardy boys in The apeman's secret, The mummy case, The mystery of Smugglers Cove /
Dixon, Franklin W.
Morrill, Leslie.
Dixon, Franklin W.Apeman's secret.
Dixon, Franklin W.Mummy case.
Dixon, Franklin W.Mystery of Smugglers Cove.
[London] Armada
1986
Contents: The apeman's secret. Originally published: London : Angus & Robertson, 1980 - The mummy case. Originally published: New York : Wanderer Books, 1980 ; London : Angus & Robertson, 1981 - The mystery of Smugglers Cove. Originally published: New York : Wanderer Books, 1980 ; London : Angus & Robertson, 1981