On your e-book collection page I did not see the Cambridge University Press Astronomy books which has 202 books and is growing with new titles.
899 = cambupebksastr
Perhaps you want to add it.
There is also Oxford Physics with 110 books but that is a backfile only with 110 books from 200 to 2008 (current from MyiLibrary)
899 = oxebksphys
You might want to consider adding these.
Good call, we'll look into it!