Map 1: Oost ende West Vrieslandts beschrijvinghe by Zacharias Heyns (1598)
Map 2: Frisiae Orientalis nuoa et exacta descriptio by Laurentius Michaelis (1579)
Map 3: Frisia Orientalis by Johannes Florianus (1595)
Frisian maps of the 1500s
A map of West and East Frisia by Zacharias Heyns (1598)