abstract
background
bark
biomass
brown
chips
closeup
color image
combustion
construction
cross section
cut
dry
energy
firewood
flavor
forest
fuel
garbage
heap
horizontal
industrial
industry
log
lumber
manufacturing
material
natural
nature
organic
pattern
pile
recycling
shaving
small
smoking
splinter
stack
texture
timber
timbering
tree
waste
white
wood
wood chip
wooden
work