Since the time of your Posting, 4 books with a Dedicated TeNo • TN • Technische Nothilfe Chapter (or Basis), have been published. Information about this very important, but previously overlooked organization, is finally coming forward from a number of Scholars, Historians and Historical Writers.
(1) Andreas Linhardt published
"The Technische Nothilfe in der Weimar Republic" in 2005/2006, and it takes us from 1918-1933, with a nice mini-chapter on the TR. Only problem (for me) is that it is in German, but I purchased it anyway, and I am slowly translating it. (Yes, it is that good!) I feel that there is no one who KNOWS more about the Technische Nothilfe in this 1919-1933 time frame that does Linhardt. (He is the source that the THW uses as its educational basis, for their own organizational history!) Enough said!
(2) Phil Nix / Georges Jerome published
"The Uniformed Police Forces of the Third Reich" in 2006, by a Swedish publisher. Excellent TeNo information, background and history, especially at the TeNo related to the Polizei. Also an excellent breakdown of the RATN and the various Landesgruppen, as well as their leaders, with subgrouping. Great reference.
(3) Littlejohn's
"Defending the Reich" - 2007- (Bender) has an excellent 70+ page chapter on the TeNo, which brought forth a great deal of completly new information, and clarification of Uniforms and Ranks, etc. (This book opened the door for a number of Collectors and Historians who has an interest in the TeNo, but who lacked vital information). It was also a verrrrrrrrrrrrrry big step up from the prior TeNo information source of 3 pages in Davis' "TR Insignia" and a few others
(4) Angolia / Taylor's
"Police, Volume 2" 
(Bender) is due out in the 1st quarter of 2009, and has > 250 dedicated TeNo / TN pages (+ 2 TN Appendices, which ID's previously unknown OG's (Ortsgruppen) and the Order of Battle for TN units posted outside of the Reich.) This book is destined to become the "Standard" for both Collectors & Historians, by which "TeNo / Technische Nothilfe" books are measured, I honestly believe. It kind of starts from where Littlejohn left off (but expending upon all area), and then it just rockets us into the TeNo Stratosphere with superb writing & outstanding TN examples (many of which have never previously been seen)! I have read a prepublication copy - and I found that the breadth of TN information is staggering! ALL information is documented and footnote referenced for accuracy. The TeNo bi-monthly magazine, "Die Räder", as well as the "DDP-Taschenbuch für die TN", both the 1942 and 1945 editions are referred to frequently, as well as other TR period references regarding the TN. This quite outstanding book has:
- Information & Photos regarding the previously 'unidentified' 1932 TN Embroidered Visor Oval, the 1932 Sleeve Patch; and uniform;
Information & Photos about the then 'new' 1933 TN Armscheibe (Lt. Shoulder Patch with Hakenkruz); 1st Metal Visor Logo and TN White Armband;
Information & Photos regarding the 1935 TN 2nd metal Visor assemblage, and TN lt. sleeve Eagle Diamond patch;
Information & Photos regarding the various TN Side Caps and Visors, throughout the time frame;
Information & Photos (and TR period color charts) of the 1936 Rank changes - the 1940 Rank changes - and the exceptional 1942/43 Rank changes - ALL with examples;
A previously unknown letter from Chef der TN and SS Gruppenführer W. Schmelcher confirming his 1943 date of taking command of the TN;
Information about & Photos of the NOT previously seen Gold Landesführer Dress Belt Buckle;
Information about & Photos of the NOT previously seen TN Vehicle Flag Finial (topper);
Information about & Photos of the NOT previously seen White TN Tunic - actually 2 models; and a TN Mantle coat;
Information about & Photos of 3 models of TN Drillich - Blue, White and Red-Green;
Information about & Photos NOT previously seen materials regarding the TN in Holland and Norway;
Information about & Photos NOT previously of the TN in service with the Heer, Luftwaffe and a Kriegsmarine reference;
Information & Photos of ALL of the TN Zivil and Membership pins, including the NOT previously seen Gold Honor Pin mit Kranz (in fine enamel);
Information & Photos regarding ALL of the 5 years of the TN Honor Badge (Ehrenzeichen der TN) (1919-1923, along with the award Urkunde for Landesführer Walther Junecke, 1920 HB #201;
And......more and more 'rare' TN Photos and Examples..... so much more, that it makes my head spin!
"IF" you have an interest in filling the prior void of TeNo / TN knowledge - then this is the book for your Reference Shelf, but you won't be able to put it down,
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once you start reading it, IMO. ....... Txs, Dave/dblmed1