keyword: thema EDItEUR::3 Time period qualifiers::3M c 1500 onwards to present day::3MP 20th century, c 1900 to c 1999::3MPB Early 20th century c 1900 to c 1950::3MPBG c 1919 to c 1939 (Inter-war period) – 1 free books.

These books are included in the Directory of Open Access Books. This means that they have been peer-reviewed and are of interest to scholars.