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Public domain pictures available of conference attendees edit
4th conference:
- https://calisphere.org/item/e17b600f98b29ccc8e8f010266c8c757/
- http://digitalcollections.ucsc.edu/digital/collection/p16019coll10/id/402/
- https://hdl.huntington.org/digital/collection/p15150coll2/id/1124
2nd conference: