MCO 13 differs from MCO 10. When MCO 13 came out Walter Korn had a
lot more source material to call on. Informator was out then.
So a lot of the lines end with another more trusted source other than
Walter's comments or him relying on 1920's and 1930's analysis which
he never went over with a fine toothed comb (and no wonder - have you
considered what a task this out without a database.)
I've found a few typo's and a lot of the more interesting lines
(dodgy sacs but giving play) are not mentioned. It's pretty dry.