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1
Dirt the erosion of civilizations /
Cyhoeddwyd 2007An electronic book accessible through the World Wide Web; click to view
Electronig eLyfr -
2
Footprints in the soil people and ideas in soil history /
Cyhoeddwyd 2006An electronic book accessible through the World Wide Web; click to view
Electronig Trafodyn Cynhadledd eLyfr -
3
Dig in! hands-on soil investigations.
Cyhoeddwyd 2001An electronic book accessible through the World Wide Web; click to view
Electronig eLyfr -
4
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5
Frontiers in soil science research report of a workshop /
Cyhoeddwyd 2009An electronic book accessible through the World Wide Web; click to view
Electronig eLyfr -
6
Dirt the erosion of civilizations /
Cyhoeddwyd 2012An electronic book accessible through the World Wide Web; click to view
Electronig eLyfr -
7
Soil genesis and classification
Cyhoeddwyd 2011An electronic book accessible through the World Wide Web; click to view
Electronig eLyfr -
8
Soil and rock description in engineering practice /
Cyhoeddwyd 2016An electronic book accessible through the World Wide Web; click to view
Electronig eLyfr -
9
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10
Soil science simplified /
Cyhoeddwyd 2016An electronic book accessible through the World Wide Web; click to view
Electronig eLyfr