Folders C.162-C.168: Incomplete series of reports numbered PEN.X.1 - PEN.X.54. Some reports are stamped 'property of the Therapeutic Research Corporation of Great Britain'. Folders C.169-C.177: Incomplete series of reports (copies), numbered PEN.C.3 - PEN.C.107. These reports are mostly by official bodies, such as the National Research Council, and include conference reports.