Lesson (Re)Learned: Always Cross-Check Your References

Today you get two “On This Day” (OTD) items for the price of one. As those of you who follow the blog regularly know, I have been making small revisions to articles posted during a previous year for a given day. (I have also added some totally new events, but – as you can imagine – it's not like I have a lot of choices for some dates.)

So, in addition to my Sesquicentennial blog/book writing, I have been looking over previous OTD items to get material ready for re-posting. And today, I checked...