TY  - BOOK
AU  - Thomson, James.E.
ED  - The Royal Society of Canada
TI  - The grenville problem: Special publications : No. 1
U1  - 551.71 DDC 21
PY  - 1956///
CY  - Canada
PB  - University of Toronto press
KW  - Precambrian geologic period
KW  - Geology
KW  - Stratigraphic geology
KW  - North America
ER  -