http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Gamma ray measurement of pavement density and bridge research program (AASHO road test)
Presented at the thirty-seventh annual meeting, January 6-10, 1958.
Special report (National Research Council (U.S.). Highway Research Board) ; 38
Publication (National Research Council (U.S.)) ; no. 627