UNESCO

=UNESCO Classification of Fields of Science and Technology=

http://unesdoc.unesco.org/images/0008/000829/082946eb.pdf

http://unesdoc.unesco.org/images/0008/000829/082946fb.pdf

http://unesdoc.unesco.org/images/0008/000829/082946sb.pdf

http://edison.upc.edu/unesco.html

=UNESCO Thesaurus=

http://www2.ulcc.ac.uk/unesco/