TY  - RPRT
TI  - Density gradient centrifugation: Application to the separation of macerals of type I, II, and III sedimentary organic matter
AU  - B.A. Stankiewicz
AU  - M.A. Kruge
AU  - J.C. Crelling
AU  - G.L. Salmon
PY  - 1994
UR  - https://pubs.usgs.gov/publication/70017343
ID  - 70017343
ER  -