DURING the recent period of uncertainty in international relations, the Research Co-ordination Committee approached several organizations having valuable unpublished data With the view of securing co-operation for their safety in case of War. The microfilm technique of duplication Was considered, since it is relatively inexpensive (about 0.Id. per page) when the necessary apparatus, which can be hired for a minimum period of one year, is available. This could be arranged if a sufficient number of bodies co-operate. The response has been satisfactory, and others interested should communicate with the Hon. Secretary, Research Co-ordination Committee, 35 Gordon Square, London, W.C.1.