My most favorite of all time is "Spring Creeks" by Lawson. Lots of nice photos--what can I say, I'm a guy. Actually, it's a great book for the type of fishing I enjoy.

Next most favorite--"Tying Emergers" by Leeson and Schollmeyer. Great techniques and great, very useful flies. Easy to use. Very much step by step.

Get them on Amazon for a great discount over stores.