Here's a list of fly fishing books available on Kindle:
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IMHO, I would publish a book traditionally and electronically.
One thing I like about going electronically is that I can make changes after the book is published.
It will be interesting to see just how well ebooks sell in the future. I don't think anyone knows.
At first I was against them, and felt I would never want to read off a small screen, but reading from a Kindle for just a few minutes changed all that.
Randy