KUGELBERG, Johan, WHAT COMES AROUND GOES AROUND Vintage Rock T- Shirts, New York: Universe Publishing, Rizzoli International, 2007, p.62, 63
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From Vintage Rock T-Shirts, page 63, Showco was the main touring company in the 1970s. Every major artist who was on the road at the time used their equipment and man power to put on their shows. The company, based in Texas, would print a limited run of T-Shirts for their crew to wear while at work. The shirts were produced in such small quantities that today they are considered to be some of the most collectible rock T-shirts made.