I don't have a physical copy of the book but I should be able to get you a scan.
This was not actually written directly by the Vilna Gaon as a book in itself but rather it is a more recent collection of his  from ideas, pieces from his other works,  and previously unpublished manuscripts arranged in a format that is more user friendly
--
Binyamin Kerman
Baltimore MD

Researching:
KERMAN Pinsk 
SPIELER Lodz, Zloczew, Belchatow
SEGALL, SCHWARTZ Piatra Neamt