R. Elliot Churchill & Steven M. Teutsch 
Principles and Practice of Public Health Surveillance [PDF ebook] 

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. V frequencies, and the need for local data, must be addressed. New analytic methods volving technologies present new opportunities and create new demands. This book.