TY  - RPRT
TI  - Extractable organic matter in Precambrian cherts
AU  - Kaplan, I. R.
AU  - Schopf, J. W.
AU  - Smith, J. W.
PY  - 1970
UR  - https://ntrs.nasa.gov/citations/19700059853
ID  - 19700059853
ER  -