Coaching Linemen Manual?

So is the linemen manual outdated?

If so how detailed is the gun offense manual in explaining the offensive line. I have a pretty good grasp of the offensive line because I played there and have coached that position. The varsity coach here is also excellent. I just wanted to add another line book to my resources. So you think the gun offense manual would be the best one?

Thanks

P.S. I hope all goes well for you this season. Ill be following you.