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Sponges Sites
Cretaceous Sponges «
http://www.cretaceous.de
Documentation and systematic description of fossil cretaceous sponges (porifera) from the campanian of misburg and höver , germany.
Sponge Reefs on the Continental Shelf «
http://www.pgc.nrcan.gc.ca/marine/9901_home.htm
Canadian geological survey program to study hexactinellid reefs.
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