Killen, Clifford J.
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- Open Library: OL2408405A
- pdbooks.info ID: 127999
Clifford J. Killen Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
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| Operating for photo-engraving process: a condensed practical treatise on the photographic or operating branch of photo-engraving | 1916 | Author | |  | |  | | 
| |