It presents a view of the Exposition grounds, and has the same wording as the reverse of the half dollar, plus the dates "1535 1935". Over 100 million were printed, making this a very common issue. Statistics The Exposition took ten months to build. It attracted 7,220,000 visitors during its 377 days of operation. Visitors brought US$37.7 million to San Diego. The cost was US$20 million. Admission was 50 cents for adults and 25 cents for children 2–11. Four restaurants provided meals: Cafe of the World, Palisades Cafe, Spanish Kitchens, and the Pioneer Days Restaurant. Twenty-one nations participated: Argentina, British Empire, Chile, China, Czechoslovakia, Denmark, Germany, Honduras, Irish Free State, Italy, Japan, Nicaragua, Norway, Panama, Paraguay, Portugal, Sweden, Uruguay, United States and Yugoslavia. Legacy Park improvements amounted to US$6 million. The exposition was so popular that some buildings were rebuilt to be made more permanent. Many buildings or reconstructed versions remain in use today, and are used by several museums and theatres in Balboa Park. In the early 1960s destruction of a few of the buildings and their replacement by aesthetically clashing modern architecture style of the new buildings "created an uproar" in San Diego's community. A 'Committee of One Hundred' was formed by citizens to protect the park buildings. The Committee convinced the City Council to enact resolutions that now require any new buildings to be designed and constructed in the Spanish Colonial Revival Style. The Committee also worked with various government agencies for the remaining original buildings to be declared a National Historic Landmark, which was awarded in 1978. In the latter 1990s the buildings most deteriorated or that had burned were carefully rebuilt to restore the original style and scale of the park's public spaces. In October 2010, the National Building Museum in Washington, D.C. opened an exhibition titled Designing Tomorrow: America's World's Fairs of the 1930s. This exhibition, which was available for view until September 2011, prominently featured the California Pacific International Exposition. References Further reading Richard W. Amero, "San Diego Invites the World to Balboa Park a Second Time," Journal of San Diego History (1985) 31#4 pp 261–280 California Pacific International Exposition Official Guide: Souvenir Program and Picture Book - 84 pages; 1935. San Diego's Balboa Park - by David Marshall, AIA, Arcadia Publishing, 2007, . External links California Pacific International Exposition: The Complete Exposition History, a book in HTML form by Richard Amero, at