Join the Natl Genealogical Society, then order the book from their library. As I recall the cost will be the cost of mailing the book to you and your return.
The library is or has been moved to St. Louis. I doubt you can get the mail service from St. Louis without being a member, but if near St. Louis you could probably take it to a chair and read.
By the way, my great-greatgrandmother and gg-grandfather Jannet (Jane) Montgomery and Samuel McMurry are messed up badly in that book. They assign Jannet to oblivion and have no more info on Samuel (he died before the Robert McMurry group moved to Kansas).