TY  - BOOK
AU  - Frey Robert W Ed.
TI  - Study of trace fossils: A synthesis of principles, problems and procedures in technology
U1  - H6, L5 
PY  - 1975///
CY  - New York    
PB  -  Springer Verlag       
KW  -  Palaeontology
KW  - Geology
ER  -