Z 2307
Braake, Alex L. ter: Beethoven letters : concept / [Alex L. ter Braake]. – [S.l.], [1971]. – 6 S.
Typoskript.
Inv.-Nr. 10891
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Z 2061
Braake, Alex L. ter: Beethoven letters / by Alex L. ter Braake. – 1972. – Zahlr. Faks. (Brief)
In: The collectors club philatelist. – 51 (1972), S. 332-344
Inv.-Nr. 11150