NAP has made its publciations free for a year now. It is a tremendous source of US government information for OHS.
Their top 10 downloads are
1 A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas
2 The Future of Nursing: Leading Change, Advancing Health
3 On Being a Scientist: A Guide to Responsible Conduct in Research: Third Edition
4 How People Learn: Brain, Mind, Experience, and School: Expanded Edition
5 Successful K-12 STEM Education: Identifying Effective Approaches in Science, Technology, Engineering, and Mathematics
6 Reference Manual on Scientific Evidence: Third Edition
7 National Science Education Standards
8 Relieving Pain in America: A Blueprint for Transforming Prevention, Care, Education, and Research
9 Science, Evolution, and Creationism
10 To Err Is Human: Building a Safer Health System
