Hi! This is Robert here, thanks for asking me about your Woodstock album
This triple LP set was originally released on Atlantic Records' Cotillion label in 1970 and later reissued on the Atlantic label. It was re-released as a double CD in 1994. Producer Eddie Kramer was the sound engineer during the three-day event.
If yours is the original Cotillion label edition (sealed, unplayed) then it would auction or eBay in the range of $180 - $270.
This example (sealed, unplayed) sold on eBay for $255.
So I would insure yours for at least $400.
Nice thing to own!