The National Academies Press
The National Academies Press (NAP) publishes the reports of the National Academies of Sciences, Engineering, and Medicine. The NAP publishes more than 200 books a year on a wide range of topics in science, engineering, and medicine, providing authoritative, independently-researched information on important matters in science and health policy.
Many of these reports are available freely to researchers. But please be aware of strict sharing rules so as not to violate copyright https://www.nap.edu/content/about-pdfs
If there is a report that you would like me to add to our collection, please send me an email so we may purchase an institutional copy.