I am not sure what information you all are looking for, but I have found a wealth of information at the Warren County Courthouse and in the census records. I have found marriage license applications, land records, death records, etc. All with ease. I found the staff helpful and friendly. I have not used the Warren County Historical Society for information, but my aunt has sent me copies of things she thought I would find interesting. The Warren library (on Market Street just down from the courthouse) also has a genealogy section. I have found a lot of information from the many newspapers they have on microfilm as well as from the local city directories. Usually I am in Warren to visit relatives and don't have a lot of time to spend researching, but each time I find several pieces to shed more light on the family tree! I also have gotten information from the Oakland Cemetary as well as the Catholic cemetary next to it. I have done all of this research in person, though. I have never tried any of it by mail.