%0 Book %A International Symposium on Gas Chromatography, Harbourn, C. L. A. %T Gas chromatography 1968 : proceedings of the seventh International Symposium on Gas Chromatography and Its Exploitation organized by the Gas Chromatography Discussion Group of the Institute of Petroleum, held at the Falkoner Centret, Copenhagen, 25-28 June 1968 %D 1969 %I Institute of Petroleum %C London