Petrologia: diferència entre les revisions
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* [http://metpetdb.rpi.edu Metamorphic Petrology Database ([[MetPetDB]])] - Department of Earth and Environmental Sciences, [[Rensselaer Polytechnic Institute]]
* [http://www.petdb.org/ Petrological Database of the Ocean Floor (PetDB)] - Center for International Earth Science Information Network (CIESIN), [[Columbia University]]
[[Categoria:Geologia]]
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