Duff, Arthur M.
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- pdbooks.info ID: 124859
Arthur M. Duff Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
| ||||||
| 50 hours a week wage calculator | 1916 | Author | |  | |  | | ||
| 52 1-2 hours a week wage calculator | 1916 | Author | | | | | | ||
| Manufacturers hourly basis wage calculator for pay rolls and labor cost: shows the amount for every quarter hour from one quarter hour up to one hundred and forty hours | 1916 | Author | | | | | | ||