Humberstone, Clara E. (Speight), Mrs, 1862–
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- Open Library: OL7158115A
- pdbooks.info ID: 18234
Mrs Clara E. (Speight) Humberstone Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
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| Spiritism: the hidden secret in Einstein's theory of relativity | 1922 | Author | |  | |  | |    
| |