Reference Radiographs are nondestructive testing standards universally accepted because of their high reliability in accept-reject actions.
Vol I -- 16 plates, to 1/4 in.
RRE039001-C01
RRE039001-C02
RRE039001-C03
RRE039001-C04
RRE039001-C05
RRE039001-C06
RRE039001-C07
RRE039001-F01
RRE039001-F02
RRE039001-R01
RRE039001-R02
RRE039001-R03
RRE039001-SN