MAP No. 6. 
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THE CITY 
WASHINGTON 
SHOWING 
LOCATION OF RESIDENCES 
CASES OF TYPHOID FEVER 
STUDIED, WHICH OCCURRED DURING 
• CASES HAVING DEFINITE ONSET OCT. 1-16. 
CASES HAVING DEFINITE ONSET OCT. 16-31. 
TWO OR MORE DOTS OR CROSSES IN A SINGLE 
CIRCLE INDICATE TWO OR MORE CASES IN THE 
SAME HOUSE. 
