I have seen this a couple of times, and I've looked everywhere...but can't figure out what it means. Anyone know?

where do you see it?

If you put   "with connections"  in the search, it brings up various books. They seem to be classics. I'm wondering what has been added to the book...questions to answer, maybe? Or a list of other books that may be of interest...?

I could be wrong but when I went and looked it seemed to be the name of the publisher  Holt Rinehard and Winston.

Yes, I think you're right.  Any idea what they mean by "with connections?"

These are books that have the complete text of the original book; but also a few other writings, such as short stories, articles, poems, or excerpts from other books that relate to the same topic. 

Two of the most trusted names in grades 6-12 educational publishing - Holt, Rinehart and Winston and McDougal Littell - have joined to become Holt McDougal, a division of Houghton Mifflin Harcourt Publishing Company.

That's a quote from their website. The books appear to be editions that have additional study materials bound into them ... probably like a reader's guide with questions .... I couldn't find out too much about it quickly.

Thanks, everybody! 

I've never heard of publishers doing that before, but it sounds interesting.

We used these kind of books for required reading when I was in High School.  It's the text of the novel with additional questions, essays, related short stories, etc. in the back.