You can search the catalog as a guest; however, to check your patron record or to check out ebooks, you need to be logged in as a patron. See the Librarian for your login information.
You can search both the Elementary and the Middle School/High School collections through the online catalog. The prefix in the call number tells you the book's location.
E -- Easy readers (Elementary Library)
LL -- Elementary Library Fiction, Non-Fiction, and Biography
J -- Middle School readers (housed in the MS/HS Library)
UL -- High School Library Fiction, Non-Fiction, and Biography
AV -- Audio-visual material. See the Librarian.
You can also search the Library's online databases and certain public databases through the catalog. Log in as a patron to use this feature. Look for the database entries in the results page.