Map 1: Tabulae Frisiae, Groningae et territorii Ambdensis by Nicolaas Visscher (middle 1600’s)
Map 2: Typus Frisiae orientalis by Ubbo Emmius and Joannes Janssonius (1630)
Map 3: Nova descriptio orientalis et occidentalis Frisiae by David Fabricius and Petrus Kaerius (1610)
