The Bardon Papers is in Tudor Books.
The Bardon Papers. Documents relating to the imprisonment & trial of Mary Queen of Scots edited for the royal historical society by Conyers Read Ph. D. (Harvard.) With a prefatory note by Charles Cotton, F.R.C.P.E., M.R.C.S. Knight of Grace of the Order of St. John of Jerusalem. Camden Third Series Vol. XVII. London Offices Of The Society 6 & 7 South Square Gray's Inn 1909.
Correspondence Between Mary Stuart [aged 43] And Anthony Babington [aged 24]. June-August, 1586. [Egerton MSS. 2124, ff. 57-64.]