A revised and updated version of
Abraham Kuyper: An Annotated Bibliography 1857-2010 by Tjitze Kuipers (2011)
You can buy a printed edition of this book on the site of the publisher.
A short, undated cover letter sent with the copy for the following day to R.C. Verwijck (1859–1937), editor at De Standaard. Kuyper relates that his doctor has absolutely forbidden him to continue working on De Standaard and that this contribution will be his last. He requests the editor to make all necessary arrangements with Idenburg. The letter was likely written in December 1919. A date is recorded on a typed copy of the letter: “Received, December 10, 1919” (AHS, 20).