Use the Tripod catalog to look for relevant books owned by Haverford, Bryn Mawr and Swarthmore.You can request Haverford and Swarthmore books and have them delivered to BMC. (The old version of Tripod, Tripod Classic, can often be easier to use if you know the title you're looking for.)
If you need an item that is not available at Bryn Mawr, you have a number of options for getting it. Always check Tripod first. If the book, journal, or other item is available at Swarthmore or Haverford, you can have it delivered to the library of your choice at Bryn Mawr by clicking on the "request" button. Requested items typically arrive within a day.