The hunt for protractors is both slowing and broadening. I’m having increasing difficulty finding unfound entries, but friends continue to come through. I thank Stephanie M. (No. 117), Corey W. (No. 182) and Anna R. (No. 222, the new highest number in the series).
I should also note that, while I am not certain of it, I believe No. 17o and No. 216 appeared since I began compiling this map. Are you out there? I would like to meet you.