Helmer, William F.
Nationality: Undetermined, possibly 
(United States)
Identities and Authority Control
- Open Library: OL1811229A
- pdbooks.info ID: 162729
William F. Helmer Contributed to the Following:
| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? | |||
|---|---|---|---|---|---|---|---|---|---|
|  |  | 
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| O. & W: the long life and slow death of the New York, Ontario & Western Railway | 1959 | Author | |  | |  |  | 
| |