You can search deeds online at:
http://www.nhdeeds.com/belknap/BeHome.html
Select county records and then accept disclaimer at bottom of page. You need Java operating to then see a search window open. You can only search by grantee and grantor back to 1950. However you can start with a current Muskat deed such as book 1972 page 789 (1972/789 in my notation) and note the references to prior deeds by book and page.
As there are multiple parcels there are several paths back. Take the 681/10 reference which leads to 250/231 which has reference to land formally of Lucy W. Luce. 250/231 also has hand drawn plans on following pages that show the abutting Luce estate.
I’m sure that you can find other paths back that may be of interest.