File:1977 Census of Construction Industries. Preliminary report, industry series. Structural Steel Erection Special Trade Contractors (IA 1977censusofcons7721unse).pdf
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![File:1977 Census of Construction Industries. Preliminary report, industry series. Structural Steel Erection Special Trade Contractors (IA 1977censusofcons7721unse).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/1977_Census_of_Construction_Industries._Preliminary_report%2C_industry_series._Structural_Steel_Erection_Special_Trade_Contractors_%28IA_1977censusofcons7721unse%29.pdf/page1-402px-thumbnail.pdf.jpg?20200619054948)
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