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.

1930

[Letter.]
In: Tweede verzameling. (Correspondentie 1899–1900). [Door] Dr. W.J. Leyds. Deel I. Eerste band. (Als manuscript gedrukt).
’s-Gravenhage, [Author] 1930 (Dordrecht, N.V. Geuze & Co), pp. 219–220.
Printed but not published.
Letter (no. 243), dated: Amsterdam, December 15, 1899.

Letter to W.J. Leyds (1859–1940), envoy extraordinary in Europe (1898–1902) of the South African Republic. In this letter (pp. 219–200), Kuyper expresses his thanks for items and information sent to him in connection with his study for 1900.03 and requests that a few other items also be sent. He also reports that he has no knowledge of an English brochure from 1884 [sic] that was purported to have been written by him (see 1883.07). For more correspondence, see 1930.05, 1931.03, 1934.02, and 1934.03. The printing costs of these collections were paid for by the author and all copies are numbered.