A map of the Massachusetts counties as they appeared between 1938 (when the Quabbin Reservoir was created) and 1947 (when the boundary between Essex and Middlesex counties was tweaked).
Original work by <a href="//commons.wikimedia.org/wiki/User:Awmcphee" title="User:Awmcphee">User:Awmcphee</a>. This version by <a href="//commons.wikimedia.org/w/index.php?title=User:WallAdhesion&amp;action=edit&amp;redlink=1" class="new" title="User:WallAdhesion (page does not exist)">User:WallAdhesion</a>.
2021-03-25
<p>This file was derived from: <a href="//commons.wikimedia.org/wiki/File:Massachusetts_county_map,_cb_500k.svg" title="File:Massachusetts county map, cb 500k.svg">Massachusetts county map, cb 500k.svg</a><br></p>
Redrawn county lines informed by <a rel="nofollow" class="external text" href="https://digital.newberry.org/ahcb/map/map.html#MA">The Newberry Library</a>