I tend to favor the tests completed by Oak Ridge National Laboratory, which indicate R-1.45 per inch for a stucco clad straw bale wall. For a good summary on the testing completed to date, see the Environmental Building News website. There is a good overview article discussing various measurements of the R-value of straw bale walls at http://www.buildinggreen.com/news/r-value.html (from Environmental Building News Volume 7, No. 9 -- October 1998).
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