IISG, in Amsterdam, is the International Institute of Social History (Internationaal Instituut voor Sociale Geschiedenis).
The IISH holds over 2,700 archival collections, some 1 million printed volumes and about as many audio-visual items. The available Collections are accessible through an online catalogue, an online index of archives and inventories. The IISH is also home to a number of other documentary institutions, most notably the Netherlands Economic History Archive (NEHA) and the Press Museum.
(More to follow @WebOL)