Note 426 — Chapter IV · THE SOURCES FOR THE PERIOD 1100–1250 A. D.
Reading edition
Duhem, Du temps, 1909, pp. 163–178; idem, Système, vol. iii, 1915, pp. 181–193.
Reading edition
Duhem, Du temps, 1909, pp. 163–178; idem, Système, vol. iii, 1915, pp. 181–193.