TY  - BOOK
AU  - Ruhl,Walter
TI  - Tar (Extra heavy oil) sands and oil shales
SN  - 343292531X
PY  - 1982///
CY  - Stuttgart
PB  - Ferdinand Enke
KW  -  Petroleum
KW  - Geology
KW  -  Oil sands
KW  -  Oil
KW  - shales
N1  - Includes bibliographical references and indexes
ER  -