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1Published 1916“...Bulgaria Economic conditions....”
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2
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3Published 1926“...Bulgaria. http://id.loc.gov/authorities/names/n81032254...”
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4Published 1918“...Bulgaria. http://id.loc.gov/authorities/names/n81032254...”
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5Published 1918“...Bulgaria. http://id.loc.gov/authorities/names/n81032254...”
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Government Document eBook