Textual criticism is the critical study of ancient mss & textual versions, usually to restore the original text (or its most reliable reading), or restoring the original edition of the text. Some, pessimistic about being able to restore original texts or editions, are content to study different mss to see how texts changed over time & reflect their socio-linguistic contexts. Its technique involves investigating the textual witnesses to the Hebrew Bible, their histories & evaluating variants in light of known scribal practices. While Klein's work is out of print, it's worth purchasing used. He does a good job discussing the significance of the LXX & the DSS to textual criticism of the Hebrew Bible.—T. Williams (edited) Editor's Foreword Preface G;ossary From Origin to Origen The LXX and the scrolls The LXX: it does make difference The Greek and Hebrew evidence Doing textual criticism Selected Bibliography