Book excerpt: Roller Derby found a home in the San Francisco Bay Area following its Depression-era Chicago origins. An early television sensation, it faded to a modest existence in Los Angeles during the 1950s. Creator Leo Seltzer turned the game over to his son Jerry, who repositioned the traveling Bay Bombers from their home terrain of San Francisco to Fresno and everywhere in-between...However, economic and cultural changes closed the Roller Derby in 1973. Passionate fans clung tenaciously to its memory. In the 21st century, the game made an astonishing return not only in Northern California but also worldwide -- Publisher's description.