Could this be the first book ever published in the territory of Dakota?

William H. Lyon

I recently found the note below in a book called The People’s Problem and Its Solution by William H. Lyon and copyrighted in 1886. This book was published by the author and printed by Press Job Print, Sioux Falls, Dakota Territory.

The note is: “Please accept this work with the complements of the author. It is believed to be the first book ever published in the territory of Dakota.”

How can I verify this claim?

Lyon’s book and picture can be found in the William H. Lyon Papers at the Archives and Special Collections.