Both books are apparently out of print at this time.
I understand that there are no immediate plans to reprint these books.
It seems a pity that the regulatory body cannot make available two seminal works.
However since the author has regrettably passed away, there may be other issues arising.
It might do not harm for persons interesting in acquiring a copy to lobby the RIAI in writing re same.
Don't despair though - specimen copies of the actual contracts can still be bought from the RIAI bookshop.