i table of contents current population survey march april 2004 match file child support abstract 1 overview introduction 2 cps sample questionnaire revisions to the processing system structure 3 relationship files publications 4 geographic limitations 7 weights earnings data how use dictionary index household record family person 6 alphabetical variable listing 5 12 19 glossary subject concepts appendices appendix a industry classification codes for detailed digit recodes 01 51 9 major 14 11 longest job last year 00 47 group 15 ii b occupational categories occupation