- American First Day Cover Society – afdcs.org
- American Philatelic Society (APA) – https://stamps.org/
- American Topical Association (ATA) – https://americantopical.org/
- Ebony Society of Philatelic Events and Reflections, Inc. (ESPER) – https://www.esperstamps.org/
Thanks for visiting SOSC, (pronounced "so-sh") and stands for State of Stamp Collecting. Here I showcase postage stamps and postal-related material with special emphasis on USA Philatelic Catalog, US first day covers, Black culture, technology, art and space.
State of Stamp Collecting 