?Eso es!: Breve gramatica para la comunicacion by Gene Kupferschmid (Boston College)
An invaluable resource for intermediate Spanish students, this flexible, modular approach to Spanish grammar serves not only as a complete grammar review, but also as a reference book and a practice manual. A practical worktext presented in 24 chapters, !Eso es! is designed either for use with the reader Exploraciones, or as an independent reference text for a composition, conversation, or reading/literature course.