An unknown people in an unknown land
Subtitle: an account of the life and customs of the Lengua Indians of the Paraguayan Chaco, with adventures and experiences during twenty years' pioneering and exploration amongst them.
By: Edited by H.T. Morrey Jones. 
Contributors: Jones, Humphrey Tudor Morrey.
Edition: 4th ed. 
Publisher: Seeley, Service and Co.
Published: 1914
Place of publication: London
Subjects: Lengua Indians.; Indians of South America -- Paraguay.; Chaco Boreal (Paraguay and Bolivia)