Willi wrote:

Although there's not alot of hatch info, the two books by Holt, Montana
Fly Fishing Guide East and West, detail MANY of waters and from my
experience, the info is good. Good reference to find out of the way
spots. The East version covers the waters around Yellowstone Park.

I have his earlier book, "Knee Deep in Montana's Trout Streams," which
is OK but has no maps. How are the maps and the access info in "Montana
Fly Fishing Guide, East"?