... Implications for the Field Galaxy Luminosity Function D. Sprayberry Kapteyn Laboratorium, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands Email: dspray@astro ... and G. D. Bothun Department of Physics, University of Oregon, Eugene, OR 97403 Email: nuts@moo.uoregon.edu ABSTRACT We present a luminosity function for low surface brightness ( LSB ) galaxies identified in the APM survey of Impey et al ... For all galaxies brighter than MB ! ... 0:1) LSB galaxies...