Question:
Which employer did Nancy E. Gwinn work for in Nov, 1981?

Context:
 Nancy E. Gwinn works for Smithsonian Institution Libraries from Jan, 1984 to Jan, 2020. 
 Nancy E. Gwinn works for Research Libraries Group from Jan, 1980 to Jan, 1984. 
 Nancy E. Gwinn works for Council on Library and Information Resources from Jan, 1975 to Jan, 1980. 
 Nancy E. Gwinn works for Library of Congress from Jan, 1969 to Jan, 1975.

Answer:
Research Libraries Group