If I remember correctly, there were very few copies of this book that were made. It was probably a master's or doctoral project and a few copies were most likely distributed to key genealogical centers.
There is a reserve copy in the Central Dallas branch library on the 9th floor genealogy section. The only other copies I could track down were in New England, I believe. There may be more.
Niles, Anne McKee and John Franklin Niles. John Niles and Some of His Descendants. Springfield, MO, 2004.