The Agency for Toxic Substances and Disease Registry (ATSDR), based in Atlanta, Georgia, is a federal public health agency of the U.S. Department of Health and Human Services.
The Case Studies in Environmental Medicine (CSEM) are a series of self-instructional publications designed to increase the primary care provider's knowledge of hazardous substances in the environment and to aid in the evaluation of potentially exposed patients.This contains specific case studies on Chromium

Chromium Toxicity
The above course as a PDF document
ATSDR Fact sheet on Chromium
Public Health Statement-Chromium