Has Deutsches Grammophon published a catalog of their R2R issues ?

Hi,

I'm wondering if Deutsches Grammophon (DGG) has ever published a catalog of the various titles they have issued on 4-track reel tape format (I never heard of any 2-track tape from them). While I often see the Beethoven/Karajan tapes, there are some rarer ones that I have seen only once or twice, and would therefore like to know what they published on this format. Any ideas ?

Thanks !
 
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