A complete guidebook on every aspect of field epidemiology by the Health Protection Agency,UK
Online lectures on epidemiology with online tests. Some links work on the main page.
An Introduction to Applied Epidemiology and Biostatistics By CDC.
The Public Health Observatory Handbook of Health Inequalities Measurement
Roy Carr-Hill, Paul Chalmers-Dixon
Course Lectures in PDF files and text by Tufts University, with exams and assignments.
A lectures series on fundamentals of epidemiology topics by the University of North Carolina