Neutron reactions have been compiled systematically since the discovery of the neutron, while charged particle and photon reactions have been covered less extensively. The IAEA collects?experimental nuclear physics data (numerical tables with experimental description) from laboratory reports, journal articles and unpublished literature, which is then included in EXFOR.?Transmission files received from co-operating centres of the international network of reaction data centres (NRDC) are also added to the database, once they have passed quality control at the IAEA.