Pre-1950s tornado tracks

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Jan 14, 2011
St. Louis
Does anyone know of a good source for pre-1950s tornado track maps or damage surveys? There is an abundance of online data for 1950s onward, but very little in the way of info for historical events prior to that. The only source I keep seeing referenced for that time period is Grazulis' Significant Tornadoes, but I'm striking out with any good online sources.