TY  - RPRT
TI  - Photon cross sections, attenuation coefficients, and energy absorption coefficients from 10 keV to 100 GeV 
AU  - Hubbell, J H
PY  - 1969
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS NSRDS 29
DO  - 10.6028/NBS.NSRDS.29
ER  -