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This category may require frequent maintenance to avoid becoming too large. It should directly contain very few, if any, pages and should mainly contain subcategories.
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This category has the following 22 subcategories, out of 22 total.
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60:Human viruses described in the 20th century
370:Species described in the 20th century
365:Viruses by year of formal description
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132:Viruses described in 1930
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106:Viruses described in 1907
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80:Viruses described in 1901
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