“Johnston and Robertson have marshalled an almost overwhelming amount of archival material into a coherent whole, covering all five continents from 1932 to 2018, whilst still producing a very readable, knowledgeable and engaging account. Archival research is at the heart of this book, with a wide variety of sources fruitfully placed in conversation with each other. … this volume makes its fascinating history available to a new generation of scholars in an erudite and accessible form.” (Emily Oliver, Archives – The Journal of the British Records Association, Vol. 55 (2), 2020)