hopper type trout fishing flies are a must for any serious fly fisher.

Dave's Hopper Fly Tying - Dave Whitlock Fly Pattern

How to Fly Fish Grasshopper Flies and Terrestrials - The Fly Crate

If you could have only 3 dry flies for your trout fishing all season, what would they be? - Quora

587 Fly Fishing the Ausable River with Dry Flies - The Hungry Trout with Evan Bottcher - Wet Fly Swing

Gorge Fly Shop Blog: Hopper Fishing for Trout

Artificial fly - Wikipedia

A beginner's guide to fly fishing: Everything you need to know - The Manual

Trout Tactics for Smallmouths - Fly Fisherman

The dirtier dozen: 12 flies that will catch trout—and more—anywhere they swim

Salomone: Four hopper-dropper variations