What are some good resources in Indo-European historical linguistics?
From a post to Elfling by Candon Clannach: Try Comparative Indo-European Linguistics: An Introduction by Robert S.P. Beekes. It’s very good; it was originally published in Dutch. Also, An Introduction to the Indo-European Languages by Philip Baldi. It’s good, but I don’t like it as well as the first. In addition: A Dictionary of Selected Synonyms in the Principal Indo-European Languages by Carl Darling Buck is fairly useful, but it is a bit dated, and he lists some Celtic words (specifically Welsh) as PIE cognates, when in fact they are Latin borrowings. From a post to Elfling by Rich Alderson: The best book currently available is Andrew Sihler, New Comparative Grammar of Greek and Latin (ISBN: 0195083458), followed closely by Oswald Szemerényi, Introduction to Indo-European Linguistics (ISBN: 0198240155). Stay away from Beekes–too idiosyncratic for a beginner, even though it’s touted as an introductory text.