TY  - RPRT
TI  - Long-term monitoring of ozone injury to Jeffrey and Ponderosa Pines in Sequoia and Kings Canyon National Parks
AU  - D. M. Ewell
AU  - D. T. Gay
PY  - 1993
UR  - https://pubs.usgs.gov/publication/70128751
ID  - 70128751
ER  -