Alex Catalogue of Electronic Texts
CELT (Corpus of Electronic Texts)
The Digital Library of the Commons (DLC)
Digital Library for Earth System Education (DLESE)
Digital Library of Information Science and Technology (dLIST)
Electronic Text Collections in Western European Literature
Electronic Texts On The Internet
Networked Digital Library of Theses and Dissertations (NDLTD)
Online Medieval and Classical Library
Pennsylvania State University Electronic Classics Site
American Association of Physics Teacher (AAPT)
American Chemical Society (ACS)
American Institute of Physics (AIP)
American Mathematical Society (AMS)
American Physical Society (APS)
American Society of Civil Engineering (ASCE)
American Society of Mechanical Engineering (ASME)
Association of Computing Machinery (ACM)
American Association of Physics Teachers (AAPT)
American Chemical Society (ACS)
American Institute of Physics (AIP)
American Mathematical Society (AMS)
American Physical Society (APS)
American Society of Civil Engineering (ASCE)
American Society of Mechanical Engineering (ASME)
Association of Computing Machinery (ACM)
Institute of Electrical and Electronics Engineering (IEEE)