Paid circulation figures for If from 1960 to 1974. Source data comes from the circulation statements each year, as follows: 
<p>Note the 1974 data was printed in the February 1975 issue of Galaxy, as If had merged with Galaxy.
</p>
Note also that the data does not necessarily come from a calendar year. The statements in the February 1973 and February 1974 issues, for example, were sworn on the 15 of September of the previous year. The circulation figures could take two or three months to come in, since it was necessary to wait for returns from news stands to know what the paid circulation was. Hence the information for the year marked 1972, above, may actually be for a twelve-month period from about July 1971 to June 1972.
<a href="//commons.wikimedia.org/wiki/User:Superwikifan" title="User:Superwikifan">Antoine G</a>
2011-09-02
<span class="int-own-work" lang="en">Own work</span>