Folded Dimensions: 
Open Dimensions: 
Date Location: 
Cover Description: Blue background with title and company logo near the bottom..  Contained on the cover is an artists rendering of a red boat leaving a dock.
Date Code:  
Scale:
Main Legend Side Features:
Opposite Side Features:  
Other: Unfortunately I don't have this map in my collection yet - however the scan of the cover has been provided to me by Gary Spaid as a reference to the map produced.  Many thanks to Dave Rowlison for providing images of the tri-folds to give a better idea of the over-all appearance of how the covers are incorporated into the design of the map.
Note:

Cover
Front Cover
RearCover
Rear Cover
1931 tri fold outside
Exterior tri-fold view.
1931 tri fold Inside
Interior tri-fold view.