During the 1980s I was greatly blessed by the monthly circular Herald of His Coming and the many articles from classic authors on prayer, revival and sanctification which it contained. I recently checked, and they are now online! The URL is Herald of His Coming.
Another circular which blessed me during those years was Pulpit Helps. The past issues up to December 2009 are now online: Pulpit Helps, but the circular itself has been superseded by Disciple magazine.