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V. Acknowledgements

The work done on this catalogue has in part been supported by the National Science Foundation in Washington D. C. The publication has been made possible by a grant from the Ford Foundation in New York. Our thanks are due to all of our former collaborators on the CATALOGUE OF GALAXIES AND OF CLUSTERS OF GALAXIES (in the following called the CAT and published in six volumes 1961 to 1968 by the California Institute of Technology), as well as to Drs. H. C. Arp, G. Chincarini, A. P. Fairall, J. B. Oke and W. L. W. Sargent who communicated to us numerous data on the spectra of compact galaxies.