en wood coal (n)
― IsA ⟶
Weight: 1.0
en organic matter (n) Source: OpenCyc 2012
en wood coal (n)
― IsA ⟶
Weight: 1.0
en fuel (n) Source: OpenCyc 2012
en wood coal (n)
― IsA ⟶
Weight: 1.0
en carbon (n) Source: OpenCyc 2012