Folded Dimensions: 
Open Dimensions: 
Date Location: Cover - top right corner.
Cover Description: The upper half of the cover features a predominant Gulf logo with title above.  In an illustration below, a female motorist, in a windshield-less auto, chats with a Gulf dealer.  
Date code:
Ontario Side Features
Quebec Side Features: 
Other: This map is number # 18 in the series. It covers the area north of Lake Superior as far down as Minneapolis and in conjunction with the other 1931 Gulf map provides more complete coverage of the province.
Note: Thanks to Richard Horwitz for sharing this map from his collection.  

31 NW Gulf Cover