TY  - BOOK
AU  - Adolf,Leonard Allen
TI  - The Operation of the English navigation system in colonial Pennsylvania 1681-1750: a case study 
PY  - 1953///
CY  - Ann Arbor, Mich.
PB  - University Microfilms International
KW  - Merchant marine
KW  - United Kingdom
KW  - History
KW  - 17th century
KW  - 18th century
KW  - United States
N1  - Thesis (Ph.D.) - University of Washington, 1953
ER  -