There is, e.g., an online version of Pokorny's dictionary:
URL: <https://indo-european.info/pokorny-etymological-dictionary/index.htm>

Title of the print version: Indogermanisches etymologisches Wörterbuch / by Julius Pokorny (Bern et al., 1959-1969, in two volumes, the last edition known to me is the 4th edition, 2002).

Hope it helps
Peter Wyzlic

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