Jobes, Karen H.; Silva, Moises. Invitation to the Septuagint. Grand Rapids: Paternoster / Baker Academic, 2000. ISBN: 9781842270615. 
Former library copy, binding fine, text is clean, includes dust jacket. Has standard library markups. 351 pp. Very good in good dust-jacket. Hardcover.
"Until now, no user-friendly introduction to the Septuagint has been available." - publisher.