This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Otto Struve US post . en Otto Struve on the US Post envelope part of Philatelic Tribute to America's Immigrants ebay pt LHDefaultDomain hash itemca ebay US Post Otto Struve US post crop PDUSGov Stamps of the United States Otto Struve
Page 2023 Free-images.com. All images are Public Domain