De verloren vallei
Series: Bibliotheek der zeven zeeën; Bibliotheek van verre reizen en zeven zeeën
Publisher: V.h. C. de Boer Jr.
Published: 1951
Place of publication: Amsterdam
Language: dut
Number of pages: 299
Notes: In fictional form.

Concludes the trilogy of which the first two volumes were Jungle Pimpernel and Het laatste bivak.