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Books about Hoecken:
The history of our cradle land (Miami and Linn Counties);: Catholic Indian missions and missionaries of Kansas... by Thomas H Kinsella (1921)
A new look at Hoecken's [sic] straight line trajectory (Memoranda in computer and cognitive science) by Michael J Roseborrough (1985)
Wiki information Hoecken:
Christian Hoecken was a Jesuit missionary of Belgian origin who worked in the United States among the first nations.