US Public Health Profiles Library, published by HL7 Public Health Work Group (http://www.hl7.org/Special/committees/pher/index.cfm). This is not an authorized publication; it is the continuous build for version 0.0.1). This version is based on the current content of https://github.com/HL7/fhir-us-phpl/ and changes regularly. See the Directory of published versions
Full Implementation Guide
The entire implementation guide (including the HTML files, definitions, validation information, etc.) may be downloaded here. In addition there are format specific definitions files.
Examples
All the examples that are used in this Implementation Guide available for download: