If you get to the right people, they'll pay for what they want. To sell it, you need to advertise it in a postal auction in the right magazine (there's one in England called Record Collector) - I'm sure someone will give you better advice if you start a thread with a more appropriate title. I would guess that it would be worth money if it was never released, but I would also guess that it has by now been released by someone entrepreneurial on CD, so you really need to make contact with the vinyl nuts.