African environmental and human security in the 21st centuryHelen E. Purkitt · First published 2010Open the Tome
Biowarfare lessons, emerging biosecurity issues, and ways to monitor dual-use biotechnology trends in the futureHelen E. Purkitt · First published 2005Open the Tome
World politics 03/04Helen E. Purkitt, Helen E Purkitt, Helen Purkitt · First published 2003Open the Tome
