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 1920 - 1983 (63 years)
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| Sources |
- [S90946] Garth Matthews, Matthews, History of American Crumplers, (Unpublished manuscript, sent to Craig Walsh 14 Nov 2026), Ref J2.1-H1.2#e~sp2, Chapter 4: the J2 Edmund line.
- [S90946] Garth Matthews, Matthews, History of American Crumplers, (Unpublished manuscript, sent to Craig Walsh 14 Nov 2026), Ref J2.1-H1.2#e, Chapter 4: the J2 Edmund line.
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