author
A little-known early 20th-century guidebook creator, likely credited through a South Dakota business rather than a widely documented individual career. The surviving record points to a practical, travel-focused publication made to help visitors explore the Black Hills by road.

by S.D. Mitchell Dakota Engineering Company
The name attached to this work appears in surviving library and ebook records as S.D. Mitchell Dakota Engineering Company or Dakota Engineering Company, Mitchell, S.D. The clearest verifiable evidence is for a single title, Souvenir Map and Guide for Tourists in the Black Hills of South Dakota, which is listed by Project Gutenberg and preserved by the Internet Archive.
That guide was originally published in 1913 in Mitchell, South Dakota, by The Mitchell Publishing Co. The book's subject matter and cataloging suggest a practical regional publication focused on Black Hills travel and automobile touring, reflecting the era's growing interest in road travel and local promotion.
Because reliable biographical information about a specific individual author is scarce, it is safest to treat this credit as connected to a company or imprint rather than to a well-documented personal literary career. No confirmed portrait image for a specific person could be verified from the available sources.