ISO 2950:1974, Brown coals and lignites -- Classification by types on the basis of total moisture content and tar yield

Brown coals are classified in this International Standard according to the following properties: total moisture content calculated on the ash-free basis; tar hiels calculated on the dry, ash-free basis. In tables class numbers, group number and code numbers of brown coal types are given. This title may contain less than 24 pages of technical content.