Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An invaluable resource!

As a historical fiction writer looking for information on "real life" in the 1920's that goes beyond the well-known fads and foibles, I have found this book to be the best resource for such information.Because it was written soon after the end of the decade, it has an immediacy that I have not found elsewhere.A must-have for 1920's buffs!