Which preposition to use with undervaluations

of Occurrences 2%

He had ever admired and veneratedhe saidthe character of the beautiful and fascinating Judith O'Calligan, who had alone, and by her unassisted merits, removed from his character that tendency toward contempt and undervaluation of women, which, he was mortified to say, he had been induced to feel from an early disappointment in love.

in Occurrences 1%

They present no temptations to the appraisers of foreign goods, who receive but small salaries, and might by undervaluation in a few cases render themselves independent.

Which preposition to use with  undervaluations