How long was the twentieth century?

Credits and licence

From

How long was the twentieth century?, Gresham College (at Gresham College)

Licence

Educational use (Gresham College's terms), as Gresham College states it.

Attribution

Gresham College states: "We positively encourage the use of the Gresham College lecture transcripts, audio and video files for educational purposes. However, we do not allow use of Gresham College materials for commercial, personal or institutional gain."

Who can watch

Teens profiles and older. How courses are placed