Keith Wiebe

Agricultural Resources and Environmental Indicators  Keith Wiebe Hardcover. Nova Science Publishers, 2006-10-29 ISBN 9781600214677     Land Quality, Agricultural Productivity, and Food Security: Biophysical Processes and Economic Choices at Local, Regional, and Global Levels  Keith Wiebe Hardcover. Edward Elgar Publishing, 2003-12-07 ISBN 9781840647525     Who Will Be Fed In The 21St Century?  Keith Wiebe Nicole Ballenger Per Pinstrup-Andersen Paperback. International Food Policy Research Institute, 2002-01-29 ISBN 9780896297043