Oral history interview with Robert Spiegel
<a href="/items/browse?advanced%5B0%5D%5Belement_id%5D=47&advanced%5B0%5D%5Btype%5D=is+exactly&advanced%5B0%5D%5Bterms%5D=%3Ca+href%3D%22%2Fitems%2Fbrowse%3Fadvanced%255B0%255D%255Belement_id%255D%3D47%26amp%3Badvanced%255B0%255D%255Btype%255D%3Dis%2Bexactly%26amp%3Badvanced%255B0%255D%255Bterms%255D%3D%2522Not%2Bto%2Bbe%2Bused%2Bfor%2Bcommercial%2Bgain%2Bor%2Bfinancial%2Bprofit%2Bwithout%2Bmy%2Bwritten%2Bpermission%2522%22%3E%22Not+to+be+used+for+commercial+gain+or+financial+profit+without+my+written+permission%22%3C%2Fa%3E">"Not to be used for commercial gain or financial profit without my written permission"