Retail Locations

California
California State Military Museum  (currently reorganizing)
Eastern California Museum
Japanese American Museum of San Jose
Japanese American National Museum
Kinokuniya Los Angeles
                   San Francisco
                   Seattle
Manzanar National Historic Site
National Japanese American Historical Society
National Steinbeck Center
Heritage Source (online) 

If you don's see Twice Heroes at you store, be sure to ask for it.
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Hawaii
 
Bishop Museum
Hawaii Army Museum
Japanese Cultural Center of Hawaii
USS Arizona Memorial