Gifford, D.P.; Isaac, G.L.; Nelson, C.M. 1980. Evidence for predation and pastoralism at Prolonged Drift: a pastoral neolithic site in Kenya. Azania Archaeological Research in Africa 15 (1): 57-108. { copied = true; setTimeout(() => copied = false, 10000); }).catch(err => { console.error('Failed to copy:', err); }); " type="button" :class="copied ? 'bg-secondary border-secondary' : 'border-primary hover:bg-primary'" class="group lg:min-w-64 flex items-center justify-between gap-5 border border-solid px-5 py-2 cursor-pointer transition-colors"> PDF download available