The magazine was initially quarterly, but eventually expanded to six issues a year and is published bi-monthly.

For the first dozen issues, the comic book was published bi-monthly.

Starting in May 1977, the index was published bi-monthly.

It is currently published bi-monthly, in full color, with a press run of slightly over 10,000 as of December 2004.

It is published bi-monthly, with each issue containing eight or more articles, and an annual total of 240 pages.

The magazine was published monthly from 1959 to 1961 then bi-monthly until November 1972.

It debuted in January 2004, and was published bi-monthly.

As of 2007, it continues to be published bi-monthly.

It is currently published bi-monthly, with a press run of slightly over 10,000 (Dec. 2004).

It was published bi-monthly, however it has since become quarterly.