The riddle of the hollow tree /
Blyton, Enid.
Ludlow, Patricia.
Blyton, Enid.Hollow tree house.
Blyton, Enid.Young adventurers and the hollow tree.
Worksop : Award Publications,
2009.
"... first published in Great Britain under the title Hollow tree house by the Lutterworth Press in 1945. First published by Award Publications Limited 2004 as The young adventurers and the hollow tree"--T.p. verso.
Aunts
Forests and forestry