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The possessive form of the plural noun trustees is trustees'.
Trustees is the plural of trustee. "The trustees had no idea where the money went"
The Trustees of Reservations was created in 1890.
Chairperson of the board of: trustees
Marian C. Manley has written:
'A handbook for library trustees' -- subject(s): Library trustees
'A handbook for the library trustees' -- subject(s): Library trustees