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::3MPBL c 1940 to c 1949 – 1 free books.

These books do not seem to be included in the Directory of Open Access Books.