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.
The School League was intended as a denominationally independent organization that aimed to counteract school absenteeism. These nine articles are reports relating to its meeting on October 27, 1869 at Utrecht. The first three articles had been published in De Heraut (see 1869.27). With the exception of a few lines on pp. 49–50 (see 1869.33), the remaining six are by authors other than Kuyper.