Brown, Thomas A. USMLE step 1 secrets / USMLE step one secrets. Thomas A. Brown, Sonali J. Shah. - 3rd ed. - Philadelphia : Saunders/Elsevier, 2013. - xvi, 864 p. : ill. ; 22 cm. - Secrets series . - Secrets series. . ISBN: 9780323085144 RM111.10 Subjects--Topical Terms: Clinical medicine.Examination Questions.