For a complete concordance of the Gregorian and the republican calendars see Stokvis, Manuel d'histoire, tome iii.
Of the Printed State Papers (1834), and the Calendars of State Papers, Ireland, including that of the Carew MSS.
For the 17th century see the Calendars of Irish State Papers, 1603-1665 (Dublin, 1772); Strafford Letters, edited by W.
It will easily be seen that the connecting link between the old and the new calendars is very slight indeed and that the expression of a date in one calendar in terms of the other is a matter of some difficulty.
This last class of documents exists in England mainly in the form of transcripts from the originals in foreign archives, which have been made for the purpose of the Venetian and Spanish Calendars of state papers.