The Traditional Fisherman's Forum

I picked up a few Richard Walker books that were from Pete Thomas's collection, all in good / very good condition.
Fly Dressing Innovations, Walker's Pitch and Dick Walker's Trout Fishing.

All are signed by Walker and dedicated to Pete Thomas "my dearest friend"

I am considering selling these books and was looking for some guidance on valuation as they are not often seen for sale.

If any collector, Walker expert could give some guidance it would be appreciated.