The stretch in late April of 1912 was also pretty insane. Both 4/20-22 and 4/27-29 featured major outbreaks in the Plains (the former also extended into the Midwest) with numerous strong-violent tornadoes (17 are rated F4 by Grazulis). It was one of the most intense periods of severe weather ever documented for those regions.Holy crap that Berlin thing is crazy. The 1910s had quite a bit of crazy tornado events, particularly June 1916 and May-June 1917, which was absolutely ridiculous. Trying to find more info on both of these outbreaks.
Also if you're looking for more on the May-June 1917 sequence, shameless plug of my article that I wrote back in 2017 for US Tornadoes: https://www.ustornadoes.com/2017/04...ys-of-mayhem-in-late-may-and-early-june-1917/
Also re: 3/23/1913, Berlin is now known as Otoe. The town of Yutan, NE was also devastated by an F4 associated with that outbreak, truly one of the more anomalous events on record given its intensity and location. Really only 3/13/1990 even comes close to that level in Nebraska/Iowa that early in the year.