Mathematical, Physical and Natural sciences: useful links

• General links
• Journals
• E-prints, degree thesis
• Libraries and bibliographies

General links

• Link utili 
• S.I.N.M.- Sistema Informativo Nazionale per la Matematica
• Online resources for mathematics
• Digital Librarian: a librarian's choice of the best of the web: mathematics, science
• Virtual reference collection
• Global Change Master Directory
• BUBL Information Service
• WWW Virtual Library - Science
• ResearchGATE Scientific network
• Scicentral (gateway to the best online science resources)
• Institute of Physics
• PSIgate: Physical Sciences Information Gateway
• Medicine and Science
• Scienceresearch.com
• Intute: helping you find the best websites for study and research
• Citeseer.IST: Scientific Literature Digital Library
• Google scholar
• http://www.math.unipd.it/~biblio/seminario/biblioteca/mat_gen.html
• The MacTutor History of Mathematics archive
• EULER: your portal to Mathematics Publications
• Textbooks in Mathematics: a list of links to useful mathematical textbooks available for free on the Internet
• e-Leo
• The Jahrbuch Project Electronic Research Archive for Mathematics (ERAM)
• Gallica-Math: Répertoire Bibliographique des Sciences Mathématiques (1894-1912)
• Project Euclid: mathematics and statistics resources online (a cura della Cornell university Library)
• Infochimica

Journals

• Catalogo italiano periodici di scienze matematiche
• The Electronic Library of Mathematics
• Hikari Ltd: Publisher of International Scientific Journals and Books
• The Journal of High Energy Physics
• PubSCIENCE
• NUMDAM (Recherche et téléchargement d’archives de revues mathématiques numérisées)

E-prints, degree thesis

• Mathematics and Physics Preprint and e-Print Servers
• The Electronic Library of Mathematics
• Tesi di laurea italiane e straniere
• ArXiv.org
• CERN Document Server

Biblioteche e bibliografie

• Sistema Bibliotecario del Politecnico di Torino
• Scuola Normale Superiore
• SISSA Scuola Internazionale Superiore Di Studi Avanzati
• MIT Science Library (Massachusetts Institute of Technology - Science library)
• Biblioteca dell' Istituto e Museo di Storia della Scienza di Firenze
• Osservatorio astronomico di Trieste - Biblioteca
• Historical Math Monographs
• PLoS (Public Library of Science)