Last I heard, there was a 5 title minimum to apply for Overdrive inclusion. But that was last year, so the number may have changed.
A grassroots publishing consortium *should* work to meet that requirement. It would have to be set up as a business entity, but that's just a matter of paperwork. For research, you'd almost have to take a stroll through the OD catalog and see what stands out as maybe-indie. (I hate to even say that, some covers speak volumes.) Then track the publisher info for clues to see if others are doing this.
Once accepted and in the catalog, the next hurdle would be getting people to request the titles at their libraries. That's when you need some serious grassroots effort. Set your license price lower than anyone else. Email the libraries and let them know about the books, your license terms and prices. Blog the crap out of it to get people to not only request the book at their local libraries, but also to support what you and many other indies are trying to do.
Just my two cents. I've found stuff online about people *talking* about doing this, but no real follow-up as to whether they were successful or even got started.
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