TY  - BOOK
AU  - Rigby,J.Keith
AU  - Collins,Desmond
TI  - Sponges of the middle cambrian Burgess shale and Stephen formations, British Columbia
T2  - ROM contributions in science; no. 1
SN  - 088854443X
U1  - 563.4 
PY  - 2004///
CY  - Toronto
PB  - Royal Ontario Museum
KW  - ESPONJAS
KW  - FOSILES
KW  - PALEONTOLOGIA
KW  - CAMBRICO
ER  -