Practicing perfectionRoger Chaffin, Gabriela Imreh, Mary Crawford · First published 2002Open the Tome
GCSE Information Systems and Information TechnologyRoger Crawford · First published 1994Open the Tome
An electron-diffraction investigation of the molecular structure of gaseous pentafluoro-sulfur hypofluorite (SOF₆)Roger Allen Crawford · First published 1959Open the Tome