For a great overview of third year rotations:
• Boards & Wards
• First Aid for the Wards

Differential Diagnosis Pocket Reference:
• Differential Diagnosis Pocket

Differential Diagnosis Reference:
• Current Medical Diagnosis & Treatment

Drug Pocket Reference:
• Pocket Pharmacopoeia
• Sanford Guide to Antimicrobial Therapy
• Drug Information Handbook 2009-2010

EKG Reference:
• Rapid Interpretation of EKGs
• EKG Pocket Survival Guide

General Pocket Reference:
• Maxwell's Quick Medical Reference
• Scut Monkey: Clinician's Pocket Reference
• Intern Pocket Survival Guide
• Medical Spanish Pocket Plus

History & Physical Examination Pocket Reference:
• Current Clinical Strategies: History & Physical...
• Bates' Pocket Guide to Physical Examination...