The Soils of MexicoPavel Krasilnikov, Ma. del Carmen Gutiérrez-Castorena, Robert J. Ahrens, Carlos Omar Cruz-Gaistardo, Sergey Sedov, Elizabeth Solleiro-Rebolledo · First published 2013Open the Tome
Digital Soil Mapping with Limited DataAlfred E. Hartemink, Robert J. Ahrens, Alex B. McBratney, Maria de Lourdes Mendonça-Santos · First published 2008Open the Tome
Soil survey of Hopi Area, Arizona, parts of Coconino and Navajo countiesRobert J Ahrens · First published 1996Open the Tome
