Sinkankas, John.
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- Open Library: OL839333A
- pdbooks.info ID: 173162
John. Sinkankas Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
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| Gem cutting: a lapidary's manual | 2d ed. | 1962 | Author | |  | |  |  | 
|