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US 997 on Cover Signed by Dr. Charles F. Richter, Creater of Richter Scale
$100.00
US 1968 (Feb 2) 997 on Cover for CA Civil Defense & Disaster Assoc. Annual Conference, Signed by Dr. Charles F. Richter, Creater of Richter Scale. Prominent seismologist and physicist.
| Condition | Cover |
|---|---|
| Grade | VF |
| Catalog Number | 997 |
