Note 232 — Chapter XIII · THE ERUPTIONS OF LLANDEILO AND BALA AGE
Reading edition
Mem. Geol. Surv. vol. iii. 2nd edit. p. 242.
[233] Proc. Camb. Phil. Soc. vol. iii. (1880), pp. 341-348.
Reading edition
Mem. Geol. Surv. vol. iii. 2nd edit. p. 242.
[233] Proc. Camb. Phil. Soc. vol. iii. (1880), pp. 341-348.