Scott,

Keokuk is a small-ish City in Iowa, located where the Desmoines River joins the
Mississippi.  ( A natural spot for a city; junction of two historically
navigable rivers. )

Are you sure that’s bone and not horn?  

I started a thread a while back about an heirloom carriage-maker’s rabbet  I
have which is missing half of its sole veneer. The Porch convinced me that horn
is more likely than bone due to its properties.

John Ruth