Pedro de Arenas's Vocabulario manual: a layman's Spanish-Nahuatl phrasebook

Almost every printed tool for Nahuatl was made by a friar for other friars. This one was made by a traveller who could not make himself understood on the road, found the big printed dictionary useless for his purpose, wrote out the Spanish sentences he actually needed, and handed them to an unnamed indigenous interpreter to turn into Nahuatl. Its table of contents is a map of what Spaniards and Nahuas said to each other — greetings and sickbeds in one chapter, orders to mine workers in the next.