TY  - BOOK
TI  - Subcommission on Devonian Stratigraphy: fossil groups important for boundary definition 
PY  - 2000///
CY  - Frankfurt a.M.
PB  - Senckenbergische Naturforschende Gesellschaft, 
KW  - გეოლოგია
KW  - სტრატიგრაფია
ER  -