TY - BOOK ID - 145519537 TI - Elements of coal chemistry PY - 1948 PB - Rotterdam : Nijgh en Van Ditmar, DB - UniCat KW - Coal KW - Humus KW - Humic acid KW - Charbon KW - Acides humiques. KW - Humus. KW - Analysis KW - Analyse. UR - https://www.unicat.be/uniCat?func=search&query=sysid:145519537 AB - ER -