St. Lawrence River pilot (Canadian edition). Supplement No. 4 to the 1931 edition: Quebec Harbour to Montreal Harbourd
Subtitle: (Corrected to September 30, 1945)
Publisher: King's Printer
Published: 1945
Place of publication: Ottawa
Language: eng
Number of pages: 36
Subjects: Pilot guides
Notes: Previous Supplements are cancelled and superseded by Supplement No. 4.