This volume investigates the primary legal developments, treaty interpretations, and international judicial decisions occurring within the 1965-1966 period. Edited by Humphrey Waldock and R. Y. Jennings, the text serves as a comprehensive record of the British Year Book of International Law. It utilizes expert analysis and primary source documentation to provide a framework for understanding the evolution of global legal standards during the mid-twentieth century.

Experts recognize this volume as a foundational archival resource for historians and legal scholars studying the mid-century international order. Readers frequently note the academic density of the prose and the specialized nature of the legal commentary provided.