EbscoHost Databases:
These databases all come from EbscoHost (the vendor that makes the interface). You can search them simultaneously by going into any one them, using the "Choose Databases" option just above the search box - at that point, you can check the boxes for the others, saving you having to search them independently
ProQuest Databases:
These databases all come from ProQuest (the vendor that makes the interface). You can search them simultaneously by going into any one them, using the "Change Databases" option just above the search box - at that point, you can check the boxes for the others, saving you having to search them independently
Additional databases to try: