Firth, Leo E.
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- pdbooks.info ID: 85863
Leo E. Firth Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
| ||||||
| Testing advertisements: a study of copy testing methods in theory and practice | 1934 | Author | |  | |  | | ||