Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Encyclopedic and very useful

I find this book with its encyclopedic bend extremely useful on those more difficult or rare cases. This is NOT a replacement for Foucar/Farhi/WHO type books or an atlas. There are very few useful images.....what you get is a much more in depth review of IHC/flow data that can't be found in any other book. There are also great tables.