Wsender,
There are quite a few books on this subject.
You may find a lot more.
This is very quick pick not a full biography on the subject.
Here are some:
Ernest Schwiebert – Nymphs, 1973
Pocket Guide to Nymph Fishing – The Cordes/La Fontaine (this is very small guide/book, can feet in your vest pocket)
Nymph Fishing for Larger Trout – Charles Brooks, (very direct, lot of illustrations)
Nymphing: - Borger Gary, Harrisburgh, PA
How to Fish from Top to Bottom - Sid Gordon
Masters On The Nymph Trout Fly Fishing Book – edited by M Migel and L Wright, 1989
Tying Trout Nymphs by Deke Meyer, 1994
TYING NYMPHS - Randall Kaufmann, 2003
Fishing Nymphs, Wet Flies & Streamers, - David L. Tieszen, **** Sternberg, John Van Vliet
NEW Nymph Fishing in Practice by Oliver Kite – 2001
STILLWATER TROUT Nymph, dry fly, streamer fishing book (anthology)
NYMPH FISHING – Dave Hughes, 1995
Nymphs Tying and Fishing by Larry Tullis, 1996
SMALL WATER TROUT FISHING RODS NYMPH – Charles Jardine
Fishing the Nymp - Jim Quick
Tying and Fishing the Nymph by Taff Price, 1996
Nymph Fishing: A History of the Art and Practice Terry, UK
NYMPH FISHING IN PRACTICE – Olivier Kite , UK
Nymph-Fishing Rivers And Streams: A Biologist's View of Taking Trout Below the Surface - Rick Hafele
Active Nymphing: Aggressive Strategies for Casting, Rigging, And Moving the Nymphs by Rich Osthoff
Nymphing: A Basic Guide to Identifying, Tying, and Fishing Artificial Nymphs - Gary A. Borger
Great nymph content in the books:
V. Marinaro, L. Magee, G. LaFontaine, L. Kreh, Aldo, J. Gierach, R. Halford,
T. Coston, J Brown, R. Bachman, N, Ringler , P. Schullery , E. Taverner, R. Traver and more.
I learned a lot from E. Schwiebert, Al Caucci and Bob Nastasi, J. Gierach, A.K. Best, Charles Brooks, Orvis pocket books.
Good nymphing!