The European Trade Union Institute (ETUI) published a book last month featuring a collection of 50 workplace safety and health posters. They were designed for or developed by agencies and advocates between 1925 and 2004. The book, The Art of Preventive Health Safety in Europe, is well worth a browse. Health and safety practitioners will recognise many old adversaries within its pages.
Many thanks to the excellent Pump Handle blog for bringing this to my attention.