The NAA study of the stoneware pottery involved a statistical analysis of 32 elements to define the chemical clusters, and these graphs illustrate the geochemical clusters identified by the principal component analyses. These two graphs, one overview (left) and one closeup of Group 1 (right), show the distributions of the 50 NAA samples used in the study by comparing the elements chromium and cesium in bivariate scatter plots. One interesting correlation is that four vessels from the Williams farmstead appear in Group 2 and are chemically similar to three sherds of Meyer Pottery from San Antonio. But the most interesting correlation is that four stoneware vessels from the Williams farmstead fall into Group 1 with all 29 of the sherds from the three Wilson pottery sites. More data are needed to confirm this, but the tentative interpretation is that the four pots from the farmstead were made at one of the Wilson potteries, and these were among the earliest African American-owned businesses in Texas.

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