Free Internal Medicine eBook (knowmedge.com/blog/high-yield-internal-medicine-board-exam-pearls-pdf-ebook/) contains topics covering all the major internal medicine categories:

- Cardiovascular Disease
- Endocrinology & Metabolism
- Gastroenterology
- General Internal Medicine
- Hematology
- Infectious Disease
- Nephrology / Urology
- Oncology
- Neurology
- Dermatology
- Pulmonary Disease & Critical Care
- Rheumatology / Orthopedics