just saw this in a newsletter this morning - perhaps you can find the book locally or on the internet ?
Finding Your Mexican Ancestors: A Beginner's Guide, by George R. and Peggy Ryskamp, is undoubtedly one of the best new genealogical books published in America in 2007. With the influx of Mexican immigrants to this country, there is a huge demand for assistance in tracing one's Mexican ancestry. George and Peggy Ryscamp are brilliant experts on the subject of Mexican, Caribbean, and Hispanic immigration. This book focuses on Mexican ancestry and reveals national and religious resources more than any other published resource to date. There are resource descriptions, directions, addresses of governmental and religious resources, and many websites that will help you find your family's records.