Montoya's Guaraní corpus — Tesoro, Arte, Bocabulario and Catecismo (Madrid, 1639–1640)

The four books with which Antonio Ruiz de Montoya fixed Guaraní in print: a grammar, a Spanish-to-Guaraní vocabulary, an 800-page Tesoro running the other way, and a catechism, all examined by the Council of the Indies and printed at Madrid in 1639 and 1640. They gave the language an orthography for sounds Castilian does not have — a mark for nasal vowels, another for guttural ones — and were reissued unaltered at Leipzig in 1876. Guaraní is today a co-official language of Paraguay.