Which is the best medical encyclopedia?

Merck Manual of Diagnosis and Therapy: The Merck Manual is a classic in medical literature and has been used by healthcare professionals for over a century. Known for its comprehensive coverage and practical guidance on diagnosis, treatment, and management of medical conditions.

Harrison's Principles of Internal Medicine: Dubbed the "go-to" textbook in internal medicine, Harrison's provides in-depth coverage of all aspects of internal medicine and a solid foundation in clinical practice.

Oxford Textbook of Medicine: Another comprehensive resource offering up-to-date information on a wide range of medical specialties, with contributions from leading experts in the field.

Davidson's Principles and Practice of Medicine: This British medical textbook focuses on clinical medicine, combining theoretical knowledge with practical application for healthcare professionals.

Lange's Current Medical Diagnosis & Treatment: A practical guide for clinicians and students, providing concise summaries and algorithms for the management of various medical conditions.

The Sanford Guide to Antimicrobial Therapy: A renowned resource in infectious diseases, offering evidence-based guidance on antimicrobial selection, dosages, and management of infections.

UpToDate: A subscription-based online medical resource updated daily with the latest research, clinical guidelines, and patient education materials.

Mayo Clinic Family Health Book: A user-friendly resource written for laypersons, covering a wide range of common medical conditions and health topics.

Brunner & Suddarth's Textbook of Medical-Surgical Nursing: A foundational textbook for nursing students and professionals, covering medical-surgical nursing topics and best practices.

The PDR (Physicians' Desk Reference): A trusted resource for drug information, including dosages, side effects, contraindications, and interactions.