Thistlebase
An Analysis of the Thistle Population Center
Kelley analyzes the geographic center of gravity of the Thistle fleet population using 1967 yearbook data, comparing two methods of calculation. He finds the class center of gravity has shifted northward to the area around Cincinnati, Ohio, with detailed statistical analysis of fleet distribution across all districts.
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This is a summary. The full article text is © the Thistle Class Association — read the original scan via the link above.