The print First Aid USMLE collection covers USMLE Steps 1, 2 and 3 study and includes high-yield facts, mnemonics, and images, as well as clerkship / specialty boards eBooks, and flashcards. There are multiple edition years available for Step 1 and Step 2, providing even more questions to help you prepare for Step tests.
Step prep, however, is not the only benefit afforded by access to these books. As with Board Vitals and Exam Master, you can review questions for specific systems as you are working them during your preclinical years, including as study aid for curricular exams.
First Aid for the USMLE Step 1 by 
First Aid for the USMLE Step 2 CK, Tenth Edition by