m 1 12 source series 11 bureau of the census industries 1967 as corrected after publication seriesm 1963 figures are based on establishment reports for each operation covered in these include all information shown well other related data different com parable therefore a given year and industry comparability various years however is affected somewhat by changes specifications establishments excludes single unit without paid em ployees 1958 1954 small which following three items was less than 500 entire value products shipped services performed others 2 expenses wages salaries supplies minerals re ceived preparation fuel purchased electric energy contract work machinery 3 capital expenditures develop ment exploration mineral properties new construction major alterations used equipment 1939 1929 general were excluded if similar amounted to 1919
