You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Valley of the Yelagago River, ca. 20 mi n.e. of Villa Alta. Along trail between Villa Alta and Hallberg ranch, on ridge entering Yelagago valley, from peak of ridge (La Cumbre) to the spring (El Pozo) where elev. Drops sharply into valley. Remove constraint Place: Valley of the Yelagago River, ca. 20 mi n.e. of Villa Alta. Along trail between Villa Alta and Hallberg ranch, on ridge entering Yelagago valley, from peak of ridge (La Cumbre) to the spring (El Pozo) where elev. Drops sharply into valley.