Felstead, Sidney Theodore, 1888–(no earlier than 1951)
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- Open Library: OL117751A
- pdbooks.info ID: 20954
Sidney Theodore Felstead Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
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| German Spies at Bay: Being an Actual Record of the German Espionage in Great Britain During the Years 1914-1918, Compiled From Official Sources | 1920 | Author | |  | |  | | 
| |
| The underworld of London | 1923 | Author | | | | | | ||
| The underworld of London | 1923 | Author | |  | | | | ||