[asheshouse]

A few links for future reference

Calais 1940 http://ibiblio.org/hyperwar/UN/UK/UK-NW ... ders-V.jpg
Boulogne 1940 http://ibiblio.org/hyperwar/UN/UK/UK-NW ... ers-IV.jpg
Dunkirk 1940 http://ibiblio.org/hyperwar/UN/UK/UK-NW ... s-xiii.jpg
Dunkirk - Outer Harbour http://ibiblio.org/hyperwar/UN/UK/UK-NW ... ders-9.jpg

There's lots of other relevant stuff on that site.

http://www.anciens-aerodromes.com/
http://www.lib.utexas.edu/maps/ams/france/

Rotterdam Images

http://appl.gemeentearchief.rotterdam.n ... .showframe (and click on Centrum-1940-Rhijn and PlancStationBeurs-1940)

This link might help in finding some inspiration from the pictures of pre-war Rotterdam:
http://www.oud-rotterdam.nl/