This page contains links to resources for environmental health sciences.

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Here is where this guide will attempt to gather sources that document, archive, or otherwise preserve public health related websites, publications, and data that have been removed from CDC, NIH, and HHS websites.
Not sure if a government website has changed since you saw it last? The best option is to find an archived version of the webpage and compare it to its current form (see Finding Webpages) below.
You can also check on Tracking Gov Info to see crowdsourced reporting of government sites, resources, and data changes or removals, though this may not be comprehensive. You can also use the website's form to report a resource you've noticed has changed.