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Cholera -- transmission
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13
Quarantine -- organization & administration
2
Yellow Fever -- transmission
2
Cholera -- prevention & control
1
Cholera -- therapy
1
Communicable Disease Control
1
Communicable Diseases
1
Epidemics
1
Housing
1
London
1
Mississippi
1
Ohio
1
Railroads
1
Sanitation -- methods
1
Water Supply
1