Magzine Name :C& En: Chemical & Engineering News, Frequency :Weekly
      Volume No       Year       Issue       Month
       71        1993        50        DECEMBER
       71        1993        51        DECEMBER
       71        1993        49        DECEMBER
       71        1993        48        NOVEMBER
       71        1993        44        NOVEMBER
       71        1993        47        NOVEMBER
       71        1993        45        NOVEMBER
       71        1993        46        NOVEMBER
       71        1993        43        OCTOBER
       71        1993        42        OCTOBER
       71        1993        40        OCTOBER
       71        1993        41        OCTOBER
       71        1993        37        SEPTEMBER
       71        1993        36        SEPTEMBER
       71        1993        39        SEPTEMBER
       71        1993        38        SEPTEMBER
       71        1993        32        AUGUST
       71        1993        35        AUGUST
       71        1993        33        AUGUST
       71        1993        31        AUGUST
       71        1993        34        AUGUST
       71        1993        30        JULY
       71        1993        27        JULY
       71        1993        28        JULY
       71        1993        29        JULY
       71        1993        24        JUNE
       71        1993        25        JUNE
       71        1993        26        JUNE
       71        1993        23        JUNE
       71        1993        20        MAY
       71        1993        22        MAY
       71        1993        21        MAY
       71        1993        14        APRIL
       71        1993        11        MARCH
       71        1993        13        MARCH
       71        1993        10        MARCH
       71        1993        12        MARCH
       71        1993        06        FEBRUARY
       71        1993        07        FEBRUARY
       71        1993        08        FEBRUARY
       71        1993        04        JANUARY
       71        1993        01        JANUARY
       71        1993        02        JANUARY
       71        1993        03        JANUARY
       69        1991        49        DECEMBER
       69        1991        51        DECEMBER
       69        1991        48        DECEMBER
       69        1991        50        DECEMBER
       69        1991        45        NOVEMBER
       69        1991        44        NOVEMBER
       69        1991        47        NOVEMBER
       69        1991        46        NOVEMBER
       69        1991        40        OCTOBER
       69        1991        43        OCTOBER
       69        1991        41        OCTOBER
       69        1991        42        OCTOBER
       69        1991        37        SEPTEMBER
       69        1991        36        SEPTEMBER
       69        1991        35        SEPTEMBER
       69        1991        39        SEPTEMBER
       69        1991        34        AUGUST
       69        1991        32        AUGUST
       69        1991        33        AUGUST
       69        1991        30        JULY
       69        1991        29        JULY
       69        1991        28        JULY
       69        1991        27        JULY
       69        1991        26        JULY
       69        1991        24        JUNE
       69        1991        25        JUNE
       69        1991        23        JUNE
       69        1991        22        JUNE
       69        1991        21        MAY
       69        1991        18        MAY
       69        1991        19        MAY
       69        1991        20        MAY
       69        1991        16        APRIL
       69        1991        14        APRIL
       69        1991        17        APRIL
       69        1991        13        APRIL
       69        1991        10        MARCH
       69        1991        11        MARCH
       69        1991        12        MARCH
       69        1991        09        MARCH
       69        1991        05        FEBRUARY
       69        1991        08        FEBRUARY
       69        1991        07        FEBRUARY
       69        1991        06        FEBRUARY
       69        1991        04        JANUARY
       69        1991        01        JANUARY
       69        1991        03        JANUARY
       69        1991        02        JANUARY