Yes. In the following example of a quotation from an early English work, the quotation appears on page 37v, so you would include both the number and the letter in your parenthetical reference:
In “Dumbe Man’s Academie,” John Bulwer writes, “The Dumbe hath the same passions as wee have for he hath the same potentialitye of the soule equal with us” (folio 37v).
Bulwer, John. “The Dumbe Man’s Academie.” British Library, London, MS Sloane 1788.
Published 11 January 2018