Northwestern Mutual Life Insurance Company

Northwestern Mutual Insurance Company, Midwestern Department Office Building -- Heating and air conditioning ground floor plan
June 18, 1964

Northwestern Mutual Insurance Company, Midwestern Department Office Building -- Heating and air conditioning main floor plan
June 18, 1964

Northwestern Mutual Insurance Company, Midwestern Department Office Building -- Joists and beams
June 18, 1964

Northwestern Mutual Insurance Company, Midwestern Department Office Building -- Roof framing plan
June 18, 1964