Instruct: Classify Amazon reviews into positive or negative sentiment
Query: best source I've seen for teaching diving ecology

I'm a scuba instructor, and have spent years looking for the perfect book to use in fish identification and underwater naturalist courses. When I found this book, I stopped looking! It is the perfect combination,and makes everything understandable to the beginner, yet still informative to us old pros! The photo tips also come in very handy in teaching photography and videography... no Caribbean diver can afford not to have this book... I mean it!