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1Published 1983“…Managua: INSSBI…”
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2Published 1985“…Managua: INSSBI…”
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3Published 1982“…Managua: INSSBI…”
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6Published 1984.“…INSSBI,…”
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11Published [1985?]“…INSSBI,…”
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12Published 1984“…INSSBI (Instituto Nicaraguense de Seguridad Social y Bienestar)…”
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