Parishes of Louisiana with major crops grown surveyed for determining
Soil Maps of the United States of America - Brevik - 2013 - Soil Science Society of America Journal - Wiley Online Library
Frontiers Property Risk Assessment for Expansive Soils in Louisiana
General state soil maps in the USA - ScienceDirect
87 General Soil Map Image: PICRYL - Public Domain Media Search Engine Public Domain Search}
87 General Soil Map Image: PICRYL - Public Domain Media Search Engine Public Domain Search}
Soil Survey of St. Helena Parish, Louisiana (1996) : United States. Natural Resources Conservation Service : Free Download, Borrow, and Streaming : Internet Archive
General soil map, St. Tammany Parish, Louisiana.
General soil map, Sabine Parish, Louisiana