Tim Flanigan talks about his book and his life time spent studying, pursuing and photographing his topic.
This work is the culmination of a lifetime and the most impressive work I've seen on the topic.
To see and purchase the book:
https://www.wildriverpress.com/
To see Tim's stunning photography:
https://timothy-flanigan.pixels.com/
https://fineartamerica.com/profiles/timothy-flanigan/art/photographs