Public school audiometry: Principles and methods. By Loraine Anson Dahl, formerly field supervisor, wisconsin state-wide hearing survey; supervisor, hearng test service, speech clinic, purdue university; research associate, department of otolaryngology, university of Iowa. With foreword by Wendell Johnson, Ph.D., director of speech, university of Illinois. Two hundred ninety pages with index and bibliography. Danville, Ill.: The interstate printers and publishers, 1949