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Items: 2

1.

Changing concepts of epidemiology.

WELCH FB.

Sanitarian. 1947 Nov-Dec;10(3):113-23. No abstract available.

PMID:
18899806
2.

Changing concepts of quarantine as a control measure.

WELCH FB.

J Sch Health. 1946 Sep;16(7):185-7. No abstract available.

PMID:
20288710

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