| Letter to the Classis of Utrecht, 5/6/1647 (5:329), 123 | ||
| Letter of thanks to the Churches of Holland, 3/13/1645 (5:179-182), 63 | ||
| Letter to the Reformed churches of Europe, 1/19/1644 (5:30-43), 14 | ||
| Apology to the Church of Bremen, 6/21/1644 (5:73), 23 | ||
| Letter to the Reformed Churches in Switzerland, 6/21/1644 (5:73), 24 | ||
| Letter to the United Provinces of the Netherlands, 7/29/1643 (5:12-16), 2 |
