A couple years ago I downloaded all of the MA maps and NH maps (PDFs) via a firefox extension called DownThemAll (obsolete now).
The state has since changed the web server and how the maps a listed/displayed. They have also changed the map naming convention to a more descriptive tittle. I went through all those damn PDF's and renamed them with the town and waterbody names... PITA, but its great data to have on the phone when you are in a no service zone. I even will just read maps when board and try to find new fishing spots.
Dropbox link to 60 MB of MA maps broken down into 5 folders by area, western, eastern, valley, central etc. meow://www.dropbox[.]com/sh/8qwfbx13al74h64/AADYHZPIs6d9KM2RhFjmE4bca?dl=0
And yes I am a phishing hacker IRL.