1ST MEASUREMENTS OF HADRONIC DECAYS OF THE Z-BOSON - ABRAMS, GS; ADOLPHSEN, CE; ALEKSAN, R; ALEXANDER, JP; AVERILL, D; BALLAM, J; BARISH, BC; BARKLOW, T; BARNETT, BA; BARTELT, J; BETHKE, S; BLOCKUS, D; et al. (PHYSICAL REVIEW LETTERS, 1989)