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What is the most used collection of the Bach Cello Suites?

Nothing wrong with these (you can look at the Anna Magdalena manuscripts or the "cleaner" printed versions):

http://imslp.org/wiki/Suites_for_Violon ... Sebastian)

As for what edition is most popular, I wouldn't have the statistics. As a low brass player, you're going to edit them for phrasing a great deal, anyway, so I propose that it won't make much difference which "original" you use.

My 1964 Peters Edition. Maybe I'll post pics to prove it. It is in tatters. My grandaughter wanted to know why I tore up my music, didn't I like it?