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In page Second-wave feminism:

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In 1969, Bryn Mawr College and Haverford College (then all male) developed a system of sharing residential colleges. When Haverford became coeducational in 1980, Bryn Mawr discussed the possibly of coeducation as well, but decided against it.[3] In 1983, Columbia University began admitting women after a decade of failed negotiations with Barnard College for a merger along the lines of Harvard and Radcliffe (Barnard has been affiliated with Columbia since 1900, but it continues to be independently governed). Wellesley College also decided against coeducation during this time.