how do i remove these drums?

I would use heat in conjunction with the PB blaster and a BFH.
Clean as much rust scale and debris as you can away from where the axle and drum meet, spray a good amount of the penetrating fluid on the axle studs and where the drum meets the axle, heat the drum evenly between the studs and the axle ''big end'' flange in the middle evenly, a very dull red at the most.
Strike the top of the drum firmly, and work your whacks 90 degrees from each other, and it will come loose.
Don't beat it enough to break the drum, but firmly.
Wear gloves, or you will burn yourself!
A screwdriver between the backing plate and the drum pried toward you might help some when hitting it.
I would also suggest that you put a lug nut on by a couple of threads so if it suddenly lets go, it won't end up in your lap or face and stay on the axle.
It's amazing what a little heat will do in conjunction with the penetrating oil.
Brake lines are the worst........