The Outline of History his comparatively huge . . .
It's a two volume compilation, loaded with historical facts, personal insights (from both Herbert and his son George).
First written in 1918 - 1919, it was revised in 1949 to cover the many advances. My copy is a 1000+ page 1971 reprint from the Doubleday presses.
A fascinating read that could have been used as a school text book, possibly even a teacher's aid and reference book.
Cheers to you and yours, Frank.