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Observatory, Carleton College, Northfield

Architect's c.1887 drawing of Goodsell Observatory, including a small floor plan. From American Architect and Building News, no. 601 (July 2, 1887).

Observers gather for the duck race at Norway Brook, August 10, 2018. Used with the permission of the Cass County Historical Society.

Observers gather for the duck race at Norway Brook, August 10, 2018. Used with the permission of the Cass County Historical Society.

Occupational therapy cottage, Rochester State Hospital, c.1940.

Swisshelm's office and home in St. Cloud, also approximately 1860.

Office of Faribault Woolen Mills, founder Carl H. Klemer standing to right of bicycle, 1897.

Watercolor on paper of the office of the St. Paul Pioneer and Democrat newspaper as the building appeared in 1858.

Officer candidates advancing during military maneuvers, 1917.

Officer candidates overlooking encampment at the Officers’ Training Camp, Fort Snelling, 1917.

Officers of Acker Post No. 21, Minnesota Grand Army of the Republic, 1873.