Ron,
First I should mention the reason you AWC prominently on my Window Cleaning Network site is, they are a featured sponsor this month and last. (There will be another sponsor featured beginning April 1.)
So I don't own the magazine, if that's what you thought. But I do write for them.
I write a safety column, and produce a column called "Working the Net" that presents examples of the dialog on my Window Cleaning Network email group. (Posts that have been edited for space and clarity.) I also do some consulting for them, mostly in the area of industry relations.
It was, as suggested in the information you posted, started as an association newsletter.
The American Window Cleaning Association - most of the members were contractors in California. I think that association lasted about a year. For many years it was the official publication of the IWCA - AWC remained independent, but offered the IWCA editorial review privileges, and the IWCA purchased a subscription for each of its members.
That arrangement continued until about 8 years ago when IWCA headquarters convinced the IWCA that headquarters should publish a magazine. That IWCA magazine, Professional Window Cleaner, has since gone digital.
American Window Cleaner Magazine has been completely independant since the break with the IWCA.
AWC has a circulation of 8,000 - it's a bi-monthly magazine supported by all the big suppliers and manufacturers in the WC industry. By that I mean they are advertising and make a point of feeding including AWC in all their PR. (Products and company news, etc.)
For what its worth, I happen to own a copy of every of AWC dating back to 1986. My issue #1 has a cutout on the back page - where I clipped the subscription form.
http://www.awcmag.com/