In April each link is checked via an automated link checker and by hand. And in November we meticulously confirm all data, including phone numbers and e-mail addresses. However, URL's, contact numbers, etc. are in a constant state of change. To help keep up with these changes, all 50 United States are periodcially solicited by e-mail to confirm directory contents. In addition, we rely upon readers who report new resources or broken links.
Tools Suggest an Internet nugget.