In addition to about 10 best selling fly fishing books, Gary is also a contributing editor to Fly Fisherman Magazine. I know in the past that he's also penned articles that have appeared in many places. If you've been around fly fishing for a while chances are good that you've read some of his stuff.
Back in 1983 Gary put together a long video series all about fly fishing techniques & skills. It's very educational. Here below is part of that video. It's been chopped up into 6 parts on youtube & you can easily find the other parts to this great video.
So while you're waiting for the streams to thaw out enough to at least see some moving water, take some time to sit back & watch a skilled angler fish. You'll probably pick up a few tricks, too. I know I did.