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Records, 1907-1996, of Plant Extension Services, liaison unit concerned with the monitoring of new construction projects and the expansion and renovation of existing buildings at the University of Michigan. Minutes of construction meetings, summary financial statements, site and building plans and proposals, blueprints, and visual materials; including files relating to the Detroit Observatory and the Natural Science Building; include undated sketch of North Campus, unsigned, but attributed to Eero Saarinen.

Plant Extension office records include detailed minutes of construction meetings, monthly reports, summary financial statements, site and building plans and proposals, and blueprints. The material is arranged alphabetically, usually by building name. Among the blueprints are files relating to the Detroit Observatory and the Natural Science Building and an undated sketch of North Campus, unsigned, but attributed to Eero Saarinen