HMB lists opus 28 in 1908 (1908, page 203) assigned to a suite for cello published by Simrock. Another case of American and European publishers using different sets of opus numbers for the same composer (can certainly think of others- of course, European publishers using different sets among themselves still happened even as late as the 1880s and later too, but somewhat less frequently I think...) Eric 03:01, 1 August 2011 (UTC)
Gotcha and great idea, I used to create similar pages on WP for similar projects and should here... op28/1908 was also created unsurprisingly for cello/piano back in those more practical days :), and you have two rows called "with" opus number btw. Eric 03:34, 1 August 2011 (UTC)