allies
architecture
away
battle
blue
bombing raids
bombs
building
bunker
cast steel factory
chimney
cloud
coast
concrete
construction
defense
dummy
essen croup
factory dummy
factory halls
german
ground monument maintenance
guide bunker
heaven
historic
historical
history
hit
krupp
military
moving railroad
night light system
occupation
old
plans constructions
protection
reinforced concrete
sky
steam plumes
stone
velbert scheindorf
was
world