ABBREVIATIONS USED IN NOTES AND BIBLIOGRAPHY

ADM Admiralty
APP Archives de la Préfecture de Police (Paris)
BL British Library
BT Board of Trade
CAB Cabinet Office
HO Home Office
FO Foreign Office
GARF State Archive of the Russian Federation
MEPO Metropolitan Police
MO3 Military Operations 3
MO5 Military Operations 5
MIIC Military Intelligence IC (see SIS)
MI5 Military Intelligence 5 (The Security Service)
NID Naval Intelligence Department/Division
PRO Public Record Office (now TNA – The National Archives)
SIS Secret Intelligence Service (MIIC, now MI6)
SSB Secret Service Bureau
TCD Trinity College, Dublin
TNA The National Archives (Kew)
WO War Office