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Hermann Potocnik 100th (Austria)
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Hermann von Helmholtz death 100th (Germany)
Hermann von Helmholtz 150th issue of Berlin
Short desc: Hermann von Helmholtz 150th
Issuer:
Berlin
Date: 8/27/1971
Occasion:
Hermann von Helmholtz
birth
Number/Year: 150
Consists of 1 stamp:
(See stamps as list)
25pf bl&multi d=Hermann von Helmholtz
Record of changes