Published photometry used to calibrate many of the images in
The de Vaucouleurs Atlas of Galaxies
Revised UBV Photometry Catalogue NGC 0001-4000,
G. Longo and A. de Vaucouleurs, University of Texas at Austin Monographs 3 and 3A, 1983, 1985
Revised UBV Photometry Catalogue NGC 4001-7836,
G. Longo and A. de Vaucouleurs, University of Texas at Austin Monographs 3 and 3A, 1983, 1985
Revised UBV Photometry Catalogue IC and anonymous galaxies,
G. Longo and A. de Vaucouleurs, University
of Texas at Austin Monographs 3 and 3A, 1983, 1985
VRI Photometry Catalogue A. de Vaucouleurs and G. Longo, University
of Texas at Austin Monograph, 1988