1 Subjects: “...20th century, c 1900 to c 1999...”

2 Subjects: “...20th century, c 1900 to c 1999 / bicssc...”

3 Subjects: “...20th century, c 1900 to c 1999 / bicssc...”

4 Subjects: “...20th century, c 1900 to c 1999...”

5 Subjects: “...20th century, c 1900 to c 1999 / bicssc...”

6 Subjects: “...20th century, c 1900 to c 1999 / bicssc...”

7 Subjects: “...thema EDItEUR::3 Time period qualifiers::3M c 1500 onwards to present day::3MP 20th century, c 1900...”

8 Subjects: “...20th century, c 1900 to c 1999 / bicssc...”