This book represents the culmination of a lifetime of research in the spoken Spanish dialects of the Americas by one of the foremost experts in this field. Based on more than sixty years of residence, travel, research, and teaching among Spanish-speaking people, Canfield's study of the phonological phenomena that have created dialects of Spanish in the Americas makes use of historical treatises, contemporary accounts, and the author's own observations. Bibliographies for each area and a main bibliography of some three hundred pertinent books and articles make this book valuable both as a text and as a reference work.