Figure 1
Location of the three towns (map drawn by the author).
Figure 2
Dutch copper of Copenhagen from 1611 (Copenhagen City Archives). The image is free to use and available at: http://starbas.net/av_ill/1/51IA1611_4.jpg.
Figure 3
Prospect of Aalborg from 1768 (After Erich Pontoppidan. Den Danske Atlas, vol. 4, København 1768). Available (and free to use) at: http://dendigitalebyport.byhistorie.dk/koebstaeder/prospekter/1024x768/73_prospekt2.jpg.
Figure 4
Prospect of Sæby from 1768 (After Erich Pontoppidan. Den Danske Atlas, vol. 4, København 1768). Available (and free to use) at: http://dendigitalebyport.byhistorie.dk/koebstaeder/prospekter/1024x768/62_prospekt.jpg.