The Society maintains a series of hard copy documents in files sorted by surname. They are referred to as the "Vertical Files" in reference to the type of file cabinets in which they are stored. You can browse an index of these surnames and associated files by clicking on the link below. Since they are unscanned documents, you will need to visit the library to access the files. It should be noted that these are only a subset of family information which the Society maintains. If your family name is not listed in the Vertical File index, then you should search the databases of digitized documents listed above.
Browse the Family Surname Files