I second what brn2hnt said. Anything by Scott Haugen on the topic of blacktail is worth reading, he's considered one of the leading sources of information on blacktail deer here in the northwest, and beyond.
HowtoHunt.com offers a informative app that you can down load onto a smart phone/tablet/mobile device. I believe most of the content is via video. Definitely worth looking into. Boyd Iverson blacktail trophy tactics II is great.
I would give a thumbs up to both Boyd Iverson and HowtoHunt.com. I found them both very informative.
I only have the time/patience to do about half the things that Boyd Iverson says to do and I have been much more successful. I can't imagine employing all of his tactics!