 It is the largest book collector's club in the United States, with more than 800 members nationwide.The genesis of the organization was an idea for including an exhibit of rare books and fine printing in the Panama Pacific International Exposition to take place in San Francisco in 1915.Edward Robeson Taylor, John Henry Nash, W. R. K. Young and James D. Blake approached Charles Moore, the president of the exposition, with the idea in 1912, to create an organization, which gathered 58 charter members by December 1912.