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 Experiences During Twenty Years' Pioneering and Exploration Amongst Them

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 Experiences During Twenty Years' Pioneering and Exploration Amongst Them