I gratefully ackowledge, assistance from

Information found in the following publications
The German Class 52 Kriegslok (ISBN 91-7266-140-2) by Frank Stenvalls Forlag proved an invaluable source. (There are both English & German versions).
My limited German reduced the value of Kriegslokomotive K52 by Helmut Skasa. A great book with many works diagrams and cut aways. (ISBN 3-9805967-6-1 German text)
Baureihe 52.80 by Michael Reimer & Dirk Endisch (ISBN 3-7654-7101-1 German text) but both with great photographs and much detail.
Brian Reid's long out of print "German Austerities" (borrowed from John Atkinson of the German Railway Society)
Eisenbahn Journal 11/96 Die Baureihe 52 (4-398013 119809 02)
Eisenbahn Journal Archive 11/96 Dampflok Report Baureihe 41-52 Tender Teil 1 (4 398021 519806 02) which contaings much information on the tenders for most heavy freight locomotives. Lots of scaled drawings.
Die Lokomotiven der Baureihe 52 - Geschichte. Einsatz und Verbleib - eine Stationierungsdokumentation. Michael Reimer's detail record of the class (ISBN 3-931647-03-X in German)
German Railways (Garvin & Fox published by Platform 5 Publications Ltd) ISBN 1 872524 50-8). Published in 1993 and a source for the last few BR52s on DBAG's books with details of their status as heizloks etc.
Austrian Railways (Garvin & Fox published by Platform 5 Publications Ltd) ISBN 1 872524 50-8). Now in its fourth edition. and a source for the fomer ÖBB, GKB JZ and DR locomotives in Austria.
Die Baureihe 52 in Österreich : Eisenbahn Kurier January 2008. Eduard Saßmann. A six page illustrated artcle on ÖBB's 52s.
Von der Kriegslok zum Arbeitstier : Dieter Wünchmann published by EK Verlag GmbH. ISBN 3-88255-355-3. A landscape layout in approximately A5, with diagrams of the variants as operated by DR in the former DDR. 96 pages of 52s in every role.
Bahn im Bild 6 - Die Reihe 52 in Österreich : Published 1987 and 993 by Verlag Pospischil of Wien. ISBN not nown. A portrait layout in approximately A5, with full page illustrations of BR52/152 throughout Austria in the '50s,'60s and '70s.
and the following people and their websites if listed. Great photos are to be found on some of these sites!

More links to host museums on individual locomotive pages