Helliwell, Charles Harold
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- Open Library: OL2322166A
- pdbooks.info ID: 85905
Charles Harold Helliwell Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
| ||||||
| Fundamentals of college mathematics | 1933 | Author | |  | |  | | ||
| Fundamentals of college mathematics | 1935 | Author | |  | | | | ||