Language

Latin American Spanish Phrasebook
by Sally Steward

Breaking Out of Beginner's Spanish
by Joseph J. Keenan

English Grammar for Students of Spanish: The Study Guide for Those Learning Spanish
by Emily Spinelli

Webster's New World Spanish Dictionary: Spanish/English English/Spanish
by Mike Gonzalez

Latin- American Spanish Dictionary: Spanish-English, English-Spanish
by Margaret H. Raventos, David L. Gold

Practice Makes Perfect: Spanish Verb Tenses
by Dorothy Devney

Wicked Spanish
Howard Tomb

The Rough Guide Dictionary Phrasebook Mexico Spanish (Rough Guide Phrasebooks)
by Rough Guides (editor)

Motivos de conversacion: Essentials of Spanish
by Robert L. Nicholas, Maria Canteli Dominicis

Take Off in Latin American Spanish (With Audio CDs)
by Rosa Martin, Oxford University Press, Oxford

Mexican etiquette and ethics: anticipating and understanding Mexican social and business behavior
by Boye De Mente

Berlitz Latin American Spanish Phrase Book & Dictionary: My parents used this when they visited Mexico for the first time and were delighted by its ease-of-use, page edges color coded by topic categories for quick look up, and the phonetic spelling pronunciation printed below the Spanish phrase. By far the best for novice speakers of Spanish.

Random House Latin-American Spanish Dictionary: Everything you'd desire in a paperback dictionary. Don't make the mistake of not getting a Latin American Spanish dictionary -- Mexico has been evolving their version Spanish for 500 years. This dictionary does a good job of identifying a lot of those differences. My personal copy is so dog-earred it won't even shut properly!

501 Spanish Verbs: Fully Conjugated in All the Tenses: The motherlode for students of Spanish. Though a little weighty, ounce-per-ounce there's no refuting that this has most clout. Impress native speakers with your command of tenses that even they aren't sure how to use!