More Language Resources on Google Books

Dizionario bolognese-italiano, italiano bolognese by Luigi Lepri and Daniele Vitali - a dictionary useful in translating between Italian and the Bolognese dialect ($).

Dizionario milanese-italiano, col repertorio italiano-milanese by Cletto Arrighi - dictionary useful in translating between Italian and the Milanese dialect (free).

Dizionario genovese-italiano by Giuseppe Olivieri - dictionary useful in translating between Italian and the Genovese dialect (free).

Gran dizionario piemontese-italiano by Vittorio di Sant'Albino - dictionary useful in translating between Italian and the Piemontese dialect (free).

Nuovo dizionario siciliano-italiano by Vincenzo Mortillario (free).

Dizionario italian ed inglese by Ferdinando Altieri - 18th century dictionary useful in finding older Italian words/occupations no longer in use (free).

...and there are many others. Explore!