TY  - BOOK
AU  - Urbanek,Adam
AU  - Towe,Kenneth M.
TI  - Ultrastructural studies on graptolites
PY  - 1974///
CY  - Washington
PB  - Smithsonian Institution Press
KW  - Graptolites
KW  - Paleontology
KW  - Ordovician
N1  - Includes bibliographies; 1. The periderm and its derivatives in the Dendroidea and in Mastigograptus.--2. The periderm and its derivatives in the Graptoloidea
ER  -