Old fragmented MBTA subway map at Orient Heights. Other photos of the map show the Green Line A Branch but this map shows Aquarium with the modern name, thus dating it to between February 13, 1967 and June 21, 1969
<a href="//commons.wikimedia.org/wiki/User:Pi.1415926535" title="User:Pi.1415926535">Pi.1415926535</a>
<span class="int-own-work" lang="en">Own work</span>