the first available version of ...
Frank's Enycloapedia Of Balanced Opening Systems
Frank's Chess Page
http://www.amateurschach.de (have a look under: Opening Book). Here you can find the download link.
Opening book in Shredder Classic GUI *.bkt format.
For engine-engine fighting ... bis der Arzt kommt.

Try it out ... it's MEGA interesting to follow how often the ECO systems switched during the first opening moves.
The opening book based on v.02 of my opening book project (79.333 lines with move transpositions).
- no bad lines (will goes more in detail with more engine analysis).
- all 500 ECO Codes can be played
- depth = 3 moves after ECO code was builded.
Be sure that in a 200 game match max. 1-2 double opening lines will be produced. Think so, in my test with 5x 200 games no double games and in the near to a _perfect_ simulation to grandmasters A00-E99 theory distribution on a percentage basis.
And all have 1.6Mb (*.zip) or unzipped 9.270Mb. So small can be a perfect opening book for engine testing. Included are 24.947 lines without move transpositions and 79.333 lines with move transpositions.
With other words ... the 24.947 lines can be used as test-set for engine testing too. I am sure with such a book engine results in Elo can be much more exactly.
Best
Frank
PS: Version 3.0 will be available after Fire 5 POP x64 is ready with engine analysis.