Can I get estimated appraisal for 11 yrs ago?

For capital gains tax purposes, I need to know the value of a property
at the time of my mother's death in '97. (The "gains,' from what I
understand, is the difference between what it was worth when she died
-- I inherited the house -- and how much I received for it.) It
wasn't appraised in '97 -- there was one in 2000. Any way -- a
website? -- I can get an estimate value for it at that time?
.