The Baltimore Catechism is the best English language catechism for its didactic method and its concise content of all of the basic truths of the Catholic faith. It is by far the easiest and the best. And, to my knowledge, it has never been translated into Spanish. Now, half of the Catholic population of the U.S. (and of the world if you include those who speak Portuguese) are Spanish speakers! Someone should consider undertaking the translation and the publication in economical editions of the various levels of that excellent catechism.
Furthermore, I have found a public domain Spanish edition of an even better (more comprehensive and more precise) Catechism (El Gran Catecismo de Deharbe) which was published and heavily used during the time of Vatican Council I and may have been one of the sources for the Baltimore Catechism for all I know. Check it out! Could someone publish it as is? That would be a great service to the country, to the Church and to the world!!! It is most necessary in the present "educational emergency", as Pope Benedict calls our present modern situation.