The organ Partitas over Psalms 124 and 136, and the organ Variaties over Psalms 101 and 146 have been published in two volumes by Spiritoso Muziekuitgeverij. Psalmen Deel 1 contains the Partitas over Psalms 124 and 136, and Psalm 124 has been transposed down to F major to make it compatible with the Dutch psalm book. Psalmen Deel 2 contains the Variaties over Psalms 101 and 146. Both volumes are available direct from the publisher if you live in mainland Europe, or from the composer if you live in the UK.