<a href="https://en.wikipedia.org/wiki/Alaska" class="extiw" title="w:Alaska">Alaska</a>'s census divisions (now known as census areas), including incorporated (organized) boroughs, as they appeared during the <a href="https://en.wikipedia.org/wiki/1970_United_States_Census" class="extiw" title="w:1970 United States Census">1970 United States Census</a>.
Elaine B. Mitchell (editor)
<i>Alaska Blue Book</i> (Second edition), Alaska Department of Education, Division of State Libraries, p. 175