This is a book which details and decyphers the dead language of Linear B. Linear B was one of the earliest written languages and was written by people who spoke "proto-Greek", i.e. the language which was later to become Classical Greek. The book lists the symbols, their pronunciation and the meanings.
Adequate but not great. It's impressive that Hooker did all of the "typesetting" on a typewriter, but the fact that everything is in monospace, however fancy that typewriter was otherwise (and it was very fancy), often makes it surprisingly hard to get a sense of the information on a page, and the problem with typewritten text is that it's more difficult to move stuff around, leading to a somewhat haphazard structure in places. Most of the information you'd expect to be in an introduction like this is there, though, even if it—like Hooker's attitude towards female scholars—is now forty years out of date.
I just really wish people would use the word "demonym" instead of "ethnic".
An excellent introduction to the understanding of Linear B, including a full table of syllabary values, in depth analysis of the relationship to later Greek words and meanings, and explanation of a number of specific inscriptions from Knossos, Pylus and Mycenae. There is much more to be known, but this is a great way to get your feet wet!