You must have an access card (student card / employee card) to enter the library. This is to ensure infection tracing if someone is diagnosed with Covid-19, so it is important that each visitor uses their card. In other words: do not let others in, but let them use their own access card.
How do we look inside? Check out muscles, tendons and bones in 3D via Human Anatomy Atlas!
Some publishers now offer free access to services such as e-books and journals for a limited time. Here are services that may be of interest to NIH.