Electrical carbonization of coal, a bibliography, 1900-1940.

"Patent index": leaves 20 22.

Light spirits from the low temperature carbonisation of coal,

Mode of access: Internet.

Carbonisation of coal in continuous vertical retorts:

Mode of access: Internet.

The "unsaturated hydrocarbons" in the gases from the carbonisation of coal,

Mode of access: Internet.

The production of active carbon from bituminous coal,

Mode of access: Internet.