Larry D. wrote:A small contribution at best: a typical Abwehrstelle (military intelligence station) had an Abwehr I (intelligence gathering) section, an Abwehr II (special ops) representative, and an Abwehr III (counterintelligence) section. Most of the personnel were older World War I veterans and soldiers from front units who had been wounded and disabled. I have been through many of the surviving Abwehr records and I do not recall seeing any station sets, i.e., war journals and papers bundled together from a particular station and thus easily retrievable. That's the bad news.
The good news is that the British and the Americans made a sustained effort to interrogate each and every Abwehr officer that fell into their hands during and after the war. There are many hundreds of these reports, some of which go on and on for up to 70 pages. Copies of these interrogation reports can be found at the U.S. National Archives spread across several record groups with RG 319 being one of them. You will find that this collection includes reports on Abwehrstelle Bukarest and a number of others that includes sections about Abwehrstelle Bukarest.
There are also 20-25 postwar books and studies about the Abwehr (German Intelligence) that you will be able to find by doing some sustained Googling.
I like to add to what Larry had mentioned above.
Abwehr I (intelligence gathering)
Abwehr II (sabotage, subversion & special operations)
Abwehr III (counter-intelligence)
Each Abwehr subsection would have it's technical section (signals intelligence, cartography etc.). Besides, the Frontauflakruengkommandos (FAK - Front reconnaissance detachments) and Frontauflakruengtruppen (FAT - Front reconnsaissance troops) are subordinated to either one of these ASTs (AbwehrSTelle - military intelligence station) and these FAKs/FATs are typically located very close to the front line. The FAK 200 series are located in the Eastern Front as well as the Balkans and the FAK 100 series are located in the Western Front.
Military attaches are typically under Abwehr I. Special units such as Brandenburgers, Kustenjaegers, Jagdkommandos, Sonderkommandos, Einheits are under Abwehr II.
I believed naval and air force intelligence (whenever there are) also were located together with a particular AST in order to coordinate intelligence matters.
For example, Richard Kauder's Luftmeldekopf Suedost (Air Intelligence Report Station-South East) is located at Budapest
I have been very interested in the operations of Abwehr and SD-Ausland from 1933-1945 but there is never a single book that details their operations comprehensively as far as I know. As Larry had mentioned, after the war, Abwehr/SS Jagdverbande/SD intelligence officers are the 3rd in the Allied search list after war criminals and technical specialists/scientists. A number of them has been interviewed and debriefed by Allied intelligence officers and their reports and manuscripts were documented under the huge multivolume WW2 German Military Studies project initiated by the US Army Center of Military History.
The secondary sources I have on this subject are:
Hitler's Spies: German Military Intelligence in WWII by David Kahn (1978)
The SS Hunter Battalions by Perry Biddiscombe (2006)
The Last Nazis by Perry Biddiscombe(2004)
Werewolf! by Perry Biddiscombe (1998)
Stalin's Secret War: Soviet Counterintelligence against the Nazis 1941-45 by Robert W. Stephan (2003)
Hitler's Secret War in South America, 1939-1945: German Military espionage and Allied Counterespionage in Brazil by Stanley E. Hilton (1999)
The Shadow War: German Espionage and United States Counterespionage in Latin America during World War II by Leslie Rout and John Bratzel (1986)
Kommando: German Special Forces of WW2 by James Lucas (1999)
The Brandenburger Commandos: Germany's Elite Warrior Spies in World War II (2005)
Hitler's Secret Commandos: Operations of the K-Verband by Helmut Blocksdorf (2008)
Hitler's Secret Enemy by Ian Colvin (1957)
The Red Orchestra by V.E. Tarrant (1995)
KG 200: The True Story by P. W. Stahl (1981)
There should be more literature in German on Abwehr operations in German language