Howarth, Helen E. (Helen Ethel)
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- pdbooks.info ID: 55245
Helen E. (Helen Ethel) Howarth Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
| ||||||
| A source book in astronomy | 1929 | Author | |  | |  | | ||