- Author: Natural Resources Conservation Service
- Language: English
- Year: 2001
- Author: Bernardino Lopes, Paulo Cravino, A. A. Silva
- Language: English
- Year: 2010
- Author: Alan I. Marcus (editor)
- Language: English
- Year: 2015
- Author: Roger Cross
- Language: English
- Year: 2002
- Author: Sergio Valverde
- Language: Spanish, Castilian
- Year: 2022
- Author: Richard Konicek-Moran
- Language: English
- Year: 2013