go to www.masslandrecords.com
pick the registry you want - either south or north bristol
if you look at your deed you will see at the bottom that another deed will be listed or noted - it's the book and page number of the previous owners deed from the previous owner. You just keep looking at the last deed to find the next deed. The deed should also have the plan number.
Sometimes you can find all the info online - sometimes you have to go to the registry to look at the books.