[dak1]

Part of the idea behind Connexions (and later OpenStax) is that educational resources are made available under a CC license, and tools are provided so that educators can use, combine, re-write, and modify the educational texts they use.

In practice, many choose to use the books as is, as they're already pretty high quality, but if you go to cnx.org and do some searches on the database, you'll find a number of variations that have been created by different professors and universities as well.

I don't think the intent (or resources) is there to give you every book for every course in a pre-selected order.

Disclaimer: I'm a former employee and developer for Connexions and OpenStax CNX, although I haven't been there for several years, so my understanding may be out of date.