Scale not given (W 82°00ʹ00ʺ--W 72°00ʹ00ʺ/N 44°00ʹ00ʺ--N 38°00ʹ00ʺ).
Note:
One map shows magnetic declination and inclination while the other shows magnetic horizontal force and total force. Coordinates derived from the maps. Removed from an unknown report or similar resource. Relief shown by hachures. "No. 47"-- In upper left border of the sheet.