Airline:

4 ship citations (2 free) in 3 resources
Airline
Book Guide to Ferryboats of Puget Sound: Past and Present
Author Patricia Lander
Published Lighthouse Press, Annapolis, Md.,
ISBN 1577852931, 9781577852933
Page 47
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Airline -- motor ferry
Book The H. W. McCurdy Marine History of the Pacific Northwest
Author Gordon R. Newell, ed.
Published Superior Publishing Company, Seattle,
Pages 361, 372, 466