Esperanto in Scotland, Chapter 8, Exercise 1
Sample answer.

Hardest: "It died out after the First World War."
The sources read show the 1926 congress and the 1950s literary period, but nothing about
clubs between the wars or after. The most useful single source: a run of club or
Federation membership records or annual reports for 1920-1960, which would show whether
members and meetings rose or fell.