Statistics for occurrence #1 of “Inter-State Wheat” in entry united-states-of-america-missouri of Harper's Encyclopedia of United States History:

...first Tuesday of April to be observed as Arbor Day......1889 David Walker, William Walker, and John Matthews, Bald-knobbers, sentenced April, 1888, finally executed at Ozark......May 10, 1889 Inter-State Wheat Growers' Association of Mississippi Valley meets at St. Louis, N. J. Coleman, presiding......Oct. 27, 1889 Woman's temperance crusade in Lathrop, etc., from......Feb. 10, 1890 State Treasurer...
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