Rocks dropped from loaded barges, Duluth ship canal

Rocks dropped from loaded barges, Duluth ship canal

Rocks dropped from loaded barges into the water, Duluth ship canal c.1900.

Color image of Rocky Ridge farm in Mansfield, Missouri, 2011.

Rocky Ridge Farm

Rocky Ridge Farm in Mansfield, Missouri. Photographed on June 24, 2011 by Wikimedia Commons user TimothyMN.

Black and white photograph of Rolette (standing) with business associates Henry Hastings Sibley (right), and possibly Franklin Steele (left), c.1857.

Rolette (standing) with Henry Hastings Sibley (right) and possibly Franklin Steele (left)

Rolette (standing) with business associates Henry Hastings Sibley (right), and possibly Franklin Steele (left), c.1857.

Roller coaster, Wonderland Amusement Park, Minneapolis.

Roller coaster, Wonderland Amusement Park, Minneapolis

The Scenic Railway (a roller coaster) at Wonderland, from above, c.1906.

Black and white photograph of the police station at the intersection of Rondo Street and Western Avenue in St. Paul, c.1900.

Rondo Street Police Station, St. Paul

Photograph of the police station at the intersection of Rondo Street and Western Avenue in St. Paul, c.1900.

Ronning Ensilage Harvester (front)

Ronning Ensilage Harvester (front)

Ronning Ensilage Harvester (front) patented by Andrean and Adolph Ronning of Minneapolis in 1915. Manufactured by the American Harvester Company, also of Minneapolis.

Ronning Ensilage Harvester (side)

Ronning Ensilage Harvester (side)

Ronning Ensilage Harvester (side) patented by Andrean and Adolph Ronning of Minneapolis in 1915. Manufactured by the American Harvester Company, also of Minneapolis.

Ronning road planer prototype

Ronning road planer prototype

Ronning road planer prototype, undated.

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