Make certain you are getting the entire record. I was using marriage records for Champaign County, Illinois, recently. They were on microfilm at the Champaign County Archives in the Urbana Free Library. For the time period I was looking for there were actually two series of marriage information. One was the marriage applications and the other was the actual license. If I had been in too much of a hurry, I might have easily overlooked one of the records.