SourceType,Descr
"A","Artifact"
"AM","Article in monograph"
"AS","Article in serial"
"BR","Bibliographic reference"
"CH","Chart"
"CM","Cartographic materials"
"CO","Collection"
"DA","Digital archive"
"DF","Machine readable data file"
"EA","Excavation archive"
"GM","Graphic material"
"IN","Index"
"M","Map"
"MF","Microform"
"MI","Miscellaneous Material"
"MO","Monograph"
"P","Photograph"
"PN","Photograph (Negative)"
"PP","Photograph (Print)"
"PV","Projected and video material"
"SE","Serial"
"SR","Scheduling record"
"UD","Unpublished document"
"VC","Verbal communication"