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1
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2Published 1942Subjects: “…INVESTIGACIONES…”
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3
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4
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5
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6Published 1882Subjects: “…5048 INFORMES DE INVESTIGACION…”
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7
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8Published 1968Subjects: “…INVESTIGACION EDUCACIONAL 4114…”
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9Published 1956Subjects: “…4113 INVESTIGACION CIENTIFICA…”
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10
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11Published 2000Subjects:Book
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12Published 1961Subjects: “…INVESTIGACION SOCIAL 4174…”
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13
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14
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15
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16
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17Published 1946Subjects:Book
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18
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19
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20