Fly hatches is the site for aquatic entomology for fly fishermen including free articles, videos, hatch, charts and what you need to know to match the hatch whether on spring creeks or freestone streams.
The classic fly fishing library contains the best fly fishing books of all time including works by hewitt, walton, labranche, skues and others as well as methods for trout and salmon fly tying and fishing.
Gene Macri is a well know aquatic and environmental scientist who has worked a variety of streams from freestone, amd streams, and of course limestone spring creeks.