It really helps to get the title of the book. Have you tried searching anywhere for books by Amy Barrington?
With the name of the book you could approach your local library and if they do not own the book then as for it through the interlibrary loan system (there may now be a small charge for this). They will check in the area, statewide and then nationally for the volume. As a genealogy book it may be reference only- if so ask if it can be sent to your library to be used in the library (sometimes the lending library does allow this).
With the title you can check ebay, amazon, used book dealers, etc.
Now to find the title...