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Epidemiology for public health practice / Robert H. Friis, Thomas A. Sellers.
- 614.4 F9129
- Friis, Robert H.
- Aspen Publishers,
- 1996.
- Gaithersburg, Md. :
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Infectious disease epidemiology : theory and practice / [edited by] Kenrad E. Nelson, Carolyn Masters Williams, Neil M.H. Graham.
- 614.5 I431
- Aspen Publishers,
- 2001. ©2001
- Gaithersburg, Maryland :