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.
This short cover letter introduced the program of the Marnix Society. It was sent, together with 1868.03, to prominent members of Dutch society (cf. 1868.01), inviting them to show their support for the society by signing a circular letter (see 1868.11) written on its behalf.