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1
Dirt the erosion of civilizations /
Publicado em 2012An electronic book accessible through the World Wide Web; click to view
Recurso Electrónico livro electrónico -
2
Notes from the ground science, soil, and society in the American countryside /
Publicado em 2009An electronic book accessible through the World Wide Web; click to view
Recurso Electrónico livro electrónico -
3
Dirt the erosion of civilizations /
Publicado em 2007An electronic book accessible through the World Wide Web; click to view
Recurso Electrónico livro electrónico -
4
Footprints in the soil people and ideas in soil history /
Publicado em 2006An electronic book accessible through the World Wide Web; click to view
Recurso Electrónico Conference Proceeding livro electrónico