| NL-Leiden: Gemeentearchief (NL-L) |
Inventaris 503: Inventaris van de archieven van de kloosters (Leiden 1917/1995)
Manuscripts of Klooster Lopsen:
 | NL-L Kloosterarchieven 112 |
| | NL-L 65052/7, Vigilieboek, ca 1480, incl. two Middle Dutch songs (Stooker & Verbeij nr 740) |
| | NL-L 65052/8, Vigilienboek, 15th century |
From Marienpoel near Leiden:
 | NL-L Kloosterarchieven 881, Professionale |
| | NL-L Kloosterarchieven 882, Liturgical prescriptions |
| | NL-L Kloosterarchieven 883, Coster boeck (more or less identical to 884) |
| | NL-L Kloosterarchieven 884, Costerinneboeck |
| | NL-L Kloosterarchieven 887, Agenda Mortuorum |
| | NL-L 65052/11, breviary, ca 1460, perhaps from Marienpoel (see BNM) |
From the Agathaklooster near Leiden
 | NL-L 65052/9, missal, 15th century |
| | NL-L 65052/10, missal, 15th century |