TY - GEN AU - Davies, Alan D AU - Cramp, A Philip C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1981-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.81-2405 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1981 TI - Coal taxonomy thesaurus of terms: ER -