David Ames Wells,
A Study of Mexico
(1887)
“ Thus, a large part of the country on the Pacific coast has scarcely been penetrated outside of the roads or "trails" which lead from the seaports to the interior. There are hundreds of square miles in Southern Mexico, especially in the States of Michoacan and Guerrero, and also in Sonora, that have never been explored, and are merely marked on the maps as "terreno desconocido"; and whole tribes of Indians that have never been brought in contact with the white man, and repel all attempts at visitation or government supervision. ”
