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.

Steve