References on Karoo fossil Reptiles

Hi,

Does anyone know of a good book on fossil Karoo reptiles?  
I have found a reference on a probably now out-of-print book 
by M.A.Cluver.  The Iziko museum's web site in Cape Town 
contains web pages that are adapted from this book but there 
is no place in the web site that says whether or not the book 
is still in print and how you might buy the book.  Has anyone 
read this book (fossil reptiles of the south african karoo)?  
I would like to read a review on it.  Specifically, does the 
book contain a lot more information than the web site has?  

Thanks, 

Paul K. McKneely