ABELL IDENTIFICATIONS OF APM CLUSTERS OF GALAXIES

We present identifications of Abell/ACO clusters of galaxies with APM clusters using the metric separation between the APM clusters' coordin ates and the nominal Abell cluster positions at both the APM and the ( measured or estimated) Abell cluster redshift. Wherever available, we also take into account the positions of the APM galaxies which have re dshift measurements. Finally, chance alignments of physically unrelate d APM and ACO clusters at discordant redshifts are removed after inspe ction of the corresponding optical UK Schmidt plates. Our compilation contains only truly physical identifications, and so supersedes the id entifications listed by Dalton et al. and also their subsequent erratu m, which both contain a significant fraction of chance coincidences be tween clusters at different distances that appear close together in pr ojection on the sky.