Helfman, John, 1881–1970
Nationality: 
(United States)
Identities and Authority Control
- Open Library: OL2388412A
- SSN: 382447745
- pdbooks.info ID: 147336
John Helfman Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
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| Board questions answered | 1911 | Author | |  | |  | | ||