Photograph of Dr. John B. Dalton demonstrating a comparison microscope

Dr. John B. Dalton demonstrating a comparison microscope

Dr. John B. Dalton demonstrates a comparison microscope, ca. 1935.

Black and white photograph of Dr. Louis A. Fritsche, c.1920.

Dr. Louis A. Fritsche

Dr. Louis A. Fritsche, c.1920.

Dr. Martha George Rogers Ripley

Dr. Martha George Rogers Ripley

Dr. Martha George Rogers Ripley, c.1905. Photograph by Marcus W. Owens.

Dr. Martin Luther King Jr. in St. Paul

Dr. Martin Luther King Jr. in St. Paul

Dr. Martin Luther King Jr. speaking against war in Vietnam, St. Paul Campus, University of Minnesota, April 27, 1967. Photograph by St. Paul Pioneer Press.

Dr. Martin Luther King Jr. in St. Paul

Dr. Martin Luther King Jr. in St. Paul

Dr. Martin Luther King speaking against war in Vietnam, St. Paul Campus, University of Minnesota, April 27, 1967. Photograph by St. Paul Pioneer Press.

Black and white photograph of Martin Luther King and his wife, Coretta Scott King, with Vice President Hubert Humphrey, c. late 1960s.

Dr. Martin Luther King, Jr.; Coretta Scott King; and Hubert Humphrey

Martin Luther King and his wife, Coretta Scott King, with Vice President Hubert Humphrey, c. late 1960s.

Black and white photograph of Dr. Moses Barron, c.1930.

Dr. Moses Barron

Dr. Moses Barron, c.1930. Barron was instrumental in founding Mount Sinai Hospital in Minneapolis.

Black and white photograph of Dr. O.D. Howard Sergeant in the Sixteenth Battalion of the Minnesota Home Guard and his grandson, Howard Maxwell, 1918.

Dr. Obadiah D. Howard, Sergeant in the Sixteenth Battalion of the Minnesota Home Guard, and his grandson

Dr. Obadiah D. Howard, Sergeant in the Sixteenth Battalion of the Minnesota Home Guard, and his grandson, Howard Maxwell, 1918.

Dr. Russell Heim, 1934.

Dr. Russell Heim

Dr. Russell Heim, 1934.

Poster calling for the election of Dr. Russell Heim as Hennepin County Coroner, 1934.

Dr. Russell Heim election poster

Poster calling for the election of Dr. Russell Heim as Hennepin County Coroner, 1934.

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