Yes, you may. To request the delivery of item(s) from one Danforth campus library to another, you must first search Primo or Classic Catalog and find the record for the desired item. For Primo, click on the 'Request' link and then the 'Request' button at the top of the screen in the window that opens up. For the Classic Catalog, click on the  'Request' button at the top or bottom of the screen. On the next screen, fill in your WUSTL Key ID (username) and password (courtesy borrowers put in name, borrower ID, and PIN). After you've chosen a library pickup location, click on the Submit button. The item will be delivered from the library that has that item to the library you wish to pick it up from, in usually about one day. Go to the circulation desk of that library to pick it up.