Much, possibly most, of it looks very usable. Go for it!
But first BUY A HANDHELD METAL DETECTOR, the kind intended for finding stray metal bits in old boards and fenceline trees. And run it over everything before you cut. You will SO not regret it, and it will save you not only damage to your tools but the chance of a serious injury (power saw blade meets old-nail-broken-off-inside-board can be nasty...)
You might even see if you could sell some of the nicer stuff (wider, better condition) - depending what sort of area you're in, people may actually want to pay money for what you're not using yourself.
Have fun,
Pat
But first BUY A HANDHELD METAL DETECTOR, the kind intended for finding stray metal bits in old boards and fenceline trees. And run it over everything before you cut. You will SO not regret it, and it will save you not only damage to your tools but the chance of a serious injury (power saw blade meets old-nail-broken-off-inside-board can be nasty...)
You might even see if you could sell some of the nicer stuff (wider, better condition) - depending what sort of area you're in, people may actually want to pay money for what you're not using yourself.
Have fun,
Pat