The document covers British sources about Iran's political changes during 1941 to 1946 when Iran was under Allied control. It is split into 13 volumes, each focusing on different parts of those years. It delves into events like 1941's early days, 1942's important moments, and key occurrences in 1943 to 1946. The aim is to explain in detail how Iran was governed and influenced during this critical period, shedding light on its political landscape under outside forces.