The worktitle athttp://imslp.org/wiki/100_Progressive_Recreations,_Book_1_%28Czerny,_Carl%29
at the bottom of the page is called '100 Progressive Etudes' and the Alternative title '100 Progressive Recreations' and
it has given the opus number 139. But as far as I know both titles handle about completely different documents and the
100 Progressive Recreations document where book 1 can be found on this workpage is certainly not opus number 139.
Can I change that?
ps Opus 139 by Czerny with 100 Progressive Studies can be found at the Henselt Library as a pd version for the EU edited by Max Vogrich, but I'm not
sure if it's pd for the USA too, because it isn't dated.