Soils of North America.  US National Soil Survey
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		Soils of Europe.  Institute of Soil Sciences, Georg-August-University of Goettingen, Germany
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		Soils of Canada. University of Northern British Columbia, Canada.
		Soils in the Tropics. Soil Science Department of North Carolina State University
		Soils of New England states.
		Böden in Niedersachsen, Handbook in German.  Niedersächsisches Landesamt für Bodenforschung
		Böden - die Haut der Erde
		Reiseführer - Zu den Böden Deutschlands