Columbia subject headings:
Geochemistry--Puerto Rico--Databases.
Geology--Puerto Rico--Databases.
Geophysics--Puerto Rico--Databases.
Mines and mineral resources--Puerto Rico--Databases.
Harvard subject headings:
Geochemistry--Puerto Rico.
Geology--Puerto Rico.
Geophysics--Puerto Rico.
Mines and mineral resources--Puerto Rico.
Princeton subject headings:
Geochemistry--Puerto Rico.
Geology--Puerto Rico.
Geophysics--Puerto Rico.
Mines and mineral resources--Puerto Rico.