National Academies Press Ebooks (NAP) [Full Text]

A searchable, multidisciplinary collection of Electronic Books published by the National Academies Press.

National Center for Case Study Teaching in Science

Promotes the nationwide application of active learning techniques to the teaching of science, with a particular emphasis in case studies and problem-based learning.  Provides access to an award-winning collection of pear-reviewed case studies.

NIST Data Gateway (NIST) [Full Text]

National Institute of Standards and Technology Standard Reference Data covers a broad range of substances and properties from many different scientific disciplines.