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In 1898, after the retirement of their father, Frederick Law Olmsted, Sr., Frederick Law Olmsted, Jr. and his half-brother, John Charles Olmsted, formed the Olmsted Brothers firm. Significant firm projects include the1906 Lewis & Clarke Exposition in Portland, Oregon and the 1909 Alaska-Yukon-Pacific Exposition in Seattle. The pair terminated the firm's involvement in the 1915 San Diego Exposition rather than despoil the natural landscape of Balboa Park with planned structures.