This series consists of reports which were not produced centrally by the Atomic Weapon Research Establishment. The series contains directorate, divisional and miscellaneous referenced reports, including progress reports. Some reports do not include organisational prefixes but instead use elements of the authors initials, date and/or serial number.
The CWD prefix (pieces 7-16) indicates Chief Warhead Development.
The GRO prefix (pieces33-208) is thought to indicate Group Relations Officer. Most of these reports concern work undertaken for other government departments - the Ministry of Defence, Mintech and especially the Department of Health and Social Security (DHSS).
The NRN prefix (pieces 295-307) are Nuclear Research Notes.
The SEFT prefix (pieces 361-448) relates to the scientific evaluation of foreign tests.
The SSPD prefix (pieces 453-502) indicates the Senior Superintendent Physics Division.