If you are planning on publishing your information in a business journal you will need to know who is reading what you publish. You do not want to try to get publicity form an audience that doesn't care.

Typically, you will find very high concentrations of readership in a few industries-real estate, health care, law and professional services. If you're interested in a particular business journal, I highly recommend that you go to their website and navigate over to the section that talks about advertising opportunities. Now we're talking about public relations, but what you'll find in there is a media kit. Typically, in the online media kit, what you're going to find is some document that gives you a breakdown, usually from a trusted source such as the Audit Bureau of Circulations, which is the independent authority that validates readership. They'll tell you percentage wise, if not number wise, how their readership breaks down by industry.

There is much more great information where this came from found in How to Use Business Journals to Tell Your Story.
http://101publicrelations.com/businessjournals.html?utm_source=prideas&utm_content=business_journals