The Working Group Memorial Museums Libraries (AGGB) was founded in 1998 on the initiative of the House of the Wannsee Conference Memorial Museum and Educational Site and the Topography of Terror Foundation. Today, the working group consists of more than 50 libraries at memorial museums, documentation centres, and contemporary history research institutions. The annual meetings serve the exchange of information between the libraries, targeted further training, and the realisation of joint projects. A central project of the AGGB is the joint online catalogue that focuses on Nazi history.