File:1977 Census of Construction Industries. Preliminary report, industry series. Heavy Construction Contractors, N.E.C. (IA 1977censusofcons779unse).pdf
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![File:1977 Census of Construction Industries. Preliminary report, industry series. Heavy Construction Contractors, N.E.C. (IA 1977censusofcons779unse).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/1977_Census_of_Construction_Industries._Preliminary_report%2C_industry_series._Heavy_Construction_Contractors%2C_N.E.C._%28IA_1977censusofcons779unse%29.pdf/page1-392px-1977_Census_of_Construction_Industries._Preliminary_report%2C_industry_series._Heavy_Construction_Contractors%2C_N.E.C._%28IA_1977censusofcons779unse%29.pdf.jpg?20200619055253)
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