The University of Kansas has received a $58 million gift from the estate of a couple who are the most generous private donors in school history.

Madison “Al” Self and his wife, Lila, died in 2013, both at the age of 91. Their donation announced Tuesday brings the total they have given to the school to $106 million.

School officials say that places them among the most generous benefactors to graduate students at a public university in the U.S.

Of the $58 million gift, $39 million will go to the Self Graduate Fellowship Fund for doctoral students, $15 will go to the Self Engineering Leadership Fellows Program and the remaining $4 million will establish a new Self Graduating Senior Fellowship Fund.