"Wildlife conservation Fiction." . . "Children's stories, Amerian." . . . "Juvenile works" . . . . . . . . . . . . . "Mystery fiction" . . "Fiction" . "The swamp monster"@en . "The swamp monster" . . . . "Detective and mystery stories"@en . "The Hardy brothers go to Big Thicket, Texas, to investigate attempts on the life of a naturalist trying to preserve the area wildlife in the face of threats from timber and oil interests."@en . "The Swamp Monster PB"@en . "The Hardy brothers go to Big Thicket, Texas, to investigate attempts on the life of a naturalist trying to preserve the area wildlife in the face of threats from timber and oil interests." . . . . . . . . . . . "Mystery and detective stories." . . . .