Do you mean looking for the release year?
Try Discogs. Make sure you have the Matrix / Runout numbers (in the deadwax) for each LP in question as this will help in pinpointing which release it could be as there can be many.
Try Discogs. Make sure you have the Matrix / Runout numbers (in the deadwax) for each LP in question as this will help in pinpointing which release it could be as there can be many.