Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very helpful Van Briggle Collector's Resource

Though dated 2002, this guide provides interesting, historical company information and is very helpful in authenticating and dating pieces. Many of the photos are very dark and don't show the lovely colors of the actual pieces. The price guide is listed seperately in the back of the book with most of the pieces identified only by plate number, so it is very cumbersome to use. Overall, a worthwhile reference book.