Perhaps you should try some spelling variations:
"Foundations of modelo economicoa serie" » "Foundations of modelo economico serie", "Foundations of modelos economicos serie", "Foundations of poder economico serie", "Foundations of modelo economica serie", "Foundations of modelo economicos teoria", "Foundations of modelo economica ariel"
"Foundations of modern economic theory" » "Foundations of modelo economico theory", "Foundations of poder economico theory", "Foundations of poder economia theory", "Foundations of modern economic history"

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