On any site that you use frequently for searching, read the "HELP" or "SEARCH HINTS." Not only that, go back and re-read them once in a while because there is undoubtedly something you have forgotten, or something that has changed. Search is not constant , it is fluid.
On abe, if you want to use "or" or "not" searches, you have to enable Boolean searching, but you can set that as a preference that is constant. One thing abe doesn't say (or didn't the last time I checked) is that you cannot use a "not" search in a field without putting a positive term in the field first. That is why I had "Lear" in my example "not" search for the keyword field.
From Worldcat, Roberts published several 19th century editions, and none of them have very many library holdings. However, this is quite normal for children's picture books. They were not purchased by libraries and are only found there now as part of a children's collection that has been assembled more recently.
The scarcity of the particular edition is nice, but in trying to sell it, the key point is going to be attractiveness.
The cover looks handcolored to me. Try asking this as a separate question thread, and, if you can, put up an enlarged image of the "L" in "Lear"