| 
 | The ornamental design for an external surface of a duck blind boat cover, as shown and described. | |||||||||||||||||
FIG. 1 is a side elevation view of an external surface of a duck blind boat cover showing my new design;
FIG. 2 is a side elevation view thereof opposite to the side shown in FIG. 1;
FIG. 3 is an enlarged front elevation view thereof;
FIG. 4 is an enlarged rear elevation view thereof;
FIG. 5 is a top plan view thereof, the opposite bottom surface being unornamented and not constituting part of the present design; and,
FIG. 6 is a fragmented enlarged sectional view, taken substantially along line 6--6 in FIG. 5.
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