Copyright catalogs at the Library of Congress. Located in room LM-404 of the James Madison Memorial Building, Washington DC.
<dl><dd>The publication data for each magazine issue was hand-entered on the 3 by 5 inch index card. This magazine was published a full month before the cover date; the January 1975 issue was published in late November 1974. Subscribers received this issue around the second week of December 1974.</dd></dl>
Michael Holley <a href="//commons.wikimedia.org/wiki/User:Swtpc6800" title="User:Swtpc6800">Swtpc6800</a>
<span class="int-own-work" lang="en">Own work</span>