USMLE Step 1 Qbook. United States Medical Licensing Examination Step 1 Qbook. - Sixth edition. - 446 pages : illustrations ; 28 cm. ISBN: 9781419550478 RM180.97 Subjects--Topical Terms: Medicine.Clinical medicine.Licensure, Medical. Subjects--Geographic Terms: United States. Index Terms--Genre/Form: Examination Questions.