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Thornthwaite Index

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When using the PTI method to design, the soil parameters em and Ym are based on the Thornthwaite Index.
 
The PTI manual has a Thornthwaite Index map that uses data from the years 1954  to 1974.  Is this the most recent map or is there a more recent one commercial available from the someone like the Soil Conservation Society?
 
Gail Kelley