"Realfagstermer er et kontrollert, pre-koordinert emneordsvokabular som i hovedsak dekker naturvitenskap, matematikk og informatikk. Emneordene er publisert som frie, åpne data, og inneholder per januar 2015 rundt 15 000 emneord som kan brukes frittstående, eller kombinert til strenger (nærmere 16 000 strenger per januar 2015)."

"Realfagstermer is a multilingual, controlled vocabulary of pre-coordinated subject headings which mainly covers the physical sciences, mathematics and computer science. It is maintained by the University of Oslo Science Library in collaboration with the University of Bergen Science Library, and covers mainly the physical sciences, mathematics and computer science. As of January 2015, the vocabulary consists of approximately 15 000 single concept headings, and about 16 000 compound headings ("subject strings"), published as open data for everyone to use freely."

Library of Congress Classification

"The Library of Congress Classification (LCC) is a classification system that was first developed in the late nineteenth and early twentieth centuries to organize and arrange the book collections of the Library of Congress. Over the course of the twentieth century, the system was adopted for use by other libraries as well, especially large academic libraries in the United States. It is currently one of the most widely used library classification systems in the world.