Note 2 — Chapter XXX · AGE OF VOLCANIC ROCKS—continued.
Reading edition
Hartung, Die Azoren, 1860; also Insel Gran Canaria, Madeira und Porto Santo, 1864, Leipsig.
Reading edition
Hartung, Die Azoren, 1860; also Insel Gran Canaria, Madeira und Porto Santo, 1864, Leipsig.