This book describes all the known ways in which the sounds of the world's languages differ. Encapsulating the work of two leading figures in the field, it will be a standard work of reference for researchers in phonetics, linguistics and speech science for many years to come. The scope of the book is truly global, with data drawn from nearly 400 languages, many of them investigated at first hand by the authors.
I have ordered a used copy of this which will hopefully be delivered sometime next week! Also ordered a physical copy of the Handbook of the International Phonetic Association! Very excited!
I didn't end up reading much of this for the class I bought it for, but from what I can tell it's a quite useful book for someone interested in linguistics (particularly in phonology and phonetics).