– Chem web:

http://www.chemweb.com/

– Chemedia:

http://www.chemedia.com/

– Chemindustry:

http://www.chemindustry.com/index.html

– Polymer-Search:

http://www.polymer-search.com/

– Sciseek:

http://www.sciseek.com/

– About.com:Chemistry:

http://chemistry.about.com/

– Chemie.DE:

http://www.chemie.de/

– Quiminet:

http://www.quiminet.com/

– Scirus:

http://www.scirus.com/

– Chemdex:

http://www.chemdex.org/

– Google libros:

http://books.google.es/

– Google académico:

http://scholar.google.es/