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Costa Rica
2
Meteorolog?a
1
Am?rica Central
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Base de datos
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Bibliotecas P?blicas
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Brenes Mes?n, Roberto, 1874-1947
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Ciencias
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Democracia
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Desarrollo econ?mico y social
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El Salvador
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Geomagnetismo
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Guatemala
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Honduras
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Instituto F?sico-Geogr?fico Nacional
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Investigaci?n cient?fica
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Mathematical Models
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Nicaragua
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