Bettkenna, Henry John, 1915–
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- pdbooks.info ID: 182054
Henry John Bettkenna Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
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| Engineering technical drafting and graphics | 1961 | Author | |  | |  |  | 
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