My family taught me that it is a very special thing to have descended from the Manx. From what I read in this bulletin board, that seems to be a general state of affairs.
The University of Texas at Austin and its alums pride themselves on having a great collection. I have explored the Isle of Man in its on-line catalogue, and the University has a nice collection of Manx related books.
For myself, if the book were made available, I would buy a copy in a New York minute.
Also, Willard van Orman Quine's son, Douglas, maintains a wonderful website related to the Quines. I imagine that he would welcome an entry in his Quine guestbook that the book is available. But I might be wrong. Suzanne