* Oral history interview with Martin Hellman Oral history interview 2004, Palo Alto, California.
* Oral history interview with Martin Hellman Oral history interview 2004, Palo Alto, California.
* Oral history interview with Martin Hellman Oral history interview 2004, Palo Alto, California.
* Oral history interview with Martin Hellman Oral history interview 2004, Palo Alto, California.
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