TY  - BOOK
AU  - Humboldt,Alexander von
TI  - A geognostical essay on the superposition of rocks in both hemispheres
AV  - QE602 .H9
PY  - 1823///
CY  - London
PB  - Longman, Hurst, Rees, Orme, Brown, and Green
KW  - Petrology
KW  - Geology
ER  -