TY  - RPRT
TI  - Climate controls on C3 vs. C4 productivity in North American grasslands from carbon isotope composition of soil organic matter
AU  - J.C. von Fischer
AU  - L.L. Tieszen
AU  - D. S. Schimel
PY  - 2008
DO  - 10.1111/j.1365-2486.2008.01552.x
UR  - https://pubs.usgs.gov/publication/70031896
ID  - 70031896
ER  -