Established in 1999, the National Herbarium of the Netherlands (NHN) combines three University herbaria-Leiden, Utrecht, and Wageningen-and hosts approximately 5.5 million specimens, making it "one of the largest herbaria in the world." Site visitors can search an extensive Collection Database with categories for Type Specimens, Annonaceae, Euphorbiaceae, Orchidaceae, Wood, and more. In addition, the NHN website links to: research information about the University branches; a complete catalogue of publications; contact information for University branches; and the three University botanical gardens which collectively host more than 30,000 living species. The site also posts announcements, and is currently advertising a full time position for Professor of Systematic Botany and Director of the NHN. Notably, the NHN libraries carry mycological and botanical literature dating back to the 16th century.