The Cropper family of Utah, Texas, Virginia, and England, 1500 to 1900Paul K. Cropper · First published 1992Open the Tome
Predicting time-varying illuminance in complex spaces with lighting control systemsPaul Cropper · First published 2001Open the Tome
Operational Research and the Social SciencesS. A. Cropper, Michael C Jackson, Paul Keys · First published 1989Open the Tome
