> Winfred
> Lehmann: "Historical Linguistics: an introduction" and
> "Theoretical bases of Indo-European languages".
The second book is well worth while. It outlines some of the main areas of
debate remaining in PIE linguistics, with suggestions for solutions. In the
process it gives a good overview of PIE. I am ashamed to admit I don't
know the first book, but I don't think there's any reason to be cautious
about Lehmann. His scholarship is sound, and speculation is clearly marked
as speculation.
Peter