Filled out everything for book whose ISBN doesn’t pop up, both at new site and old, but I can’t “Submit” it.
Do you mean you are trying to create a page?
First used Advanced Search – use title (no subtitle), author last name, and year. Make sure to select “during” for year.
There may be a page that is suppressed due to lack of image or other defect.
If you have done that and are trying to create – make sure you have Advanced View engaged.