<p>Map of Massachusetts House of Representatives's 1st Essex district, apportioned in 1973.<a rel="nofollow" class="external autonumber" href="https://archives.lib.state.ma.us/handle/2452/26842">[1]</a> 
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The map is part of a larger map of the 240 districts of the Massachusetts House of Representatives.
Massachusetts General Court
<a rel="nofollow" class="external free" href="https://malegislature.gov/Redistricting/HistoricDistricts/House">https://malegislature.gov/Redistricting/HistoricDistricts/House</a>