LSJ
Adv., Aeol. and Dor. for ἔμπροσθεν, Tab.Heracl. 1.57, 101, A.D. Adv. 153.17.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
dor. = ἔμπροσθεν ; tab. Heracl.; Apoll.Dysc. adv. 563.24.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)