What is the best reference book for load bearing wood structure?

The best reference book for load bearing wood structure is the National Design Specification for Wood Construction (NDS). This book provides the most comprehensive and up-to-date information on the design of wood structures, including load bearing systems. It is published by the American Wood Council (AWC) and is used by engineers and architects all over the United States.

The NDS provides detailed information on the properties of different types of wood, the design of wood members and connections, and the analysis and design of wood structures. It also includes information on the effects of environmental conditions on wood structures, such as moisture, temperature, and fire.

The NDS is an invaluable resource for anyone involved in the design of load bearing wood structures. It is a comprehensive and up-to-date source of information that can help engineers and architects design safe, efficient, and economical wood structures.