Seems we are talking about 2 different books!
The one shown in Maryrrf's link was published in 1998 as The Andy M. Stewart Collection, and includes some newer material than the original Songbook (as it says in the forward to the book).
I have a copy of the 1998 book, which I bought at one of Andy's concerts about 4 or 5 years ago: it contains 60 songs in all, including "Valley of Strathmore". The only illustrations are black and white photos and the copy of the engraving of Gowrie's Tower, Perth.
The publishers (and copyright holders) of the 1998 book are:
Strathmore Music and Film Services,
PO Box 13223,
Galashiels, TD1 2YH
Scotland
ISBN number: 0-8256-9420-S