This third edition is basically the same as the second. However, IPA phonetic symbols are used more consistently throughout, the data in many examples and problems have been rechecked in the sources and corrected where necessary, and some of the references have been updated. Although some users might prefer a more extensive revision, I hope the present edition will help continue to fill the need for a text that is oriented to the student interested in interaction with data from previously unstudied or little studied languages.