1930
1930s
20th
30s
and
archival
archive
b&w
base
belgian
belgium
black
building
buildings
cast-in-situ
century
concrete
construction
deep
drive
driving
edgard
engineer
engineering
engineers
expanded
experiment
footing
foundation
foundations
franki
frankignoul
ground
historic
historical
liege
load
old
photo
photograph
pile
piles
piling
pressure-injected
soil
structure
structures
system
technology
test
testing
thirties
twentieth
university
white