Humphrey Tudor Morrey Jones

• An Unknown People in an Unknown Land; an Account of the Life and Customs of the Lengua Indians of the Paraguayan Chaco, With Adventures and ... Pioneering and Exploration Amongst Them
• Unknown People in an Unknown Land; 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