APA Style
United States. Department of the Interior, Washington, DC.. ().
Geologic Map of the Potomac River Gorge :[computer file]. great falls parks. Virginia, and part of the C&O canal national historical park, Maryland. .
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.
Chicago Style
United States. Department of the Interior, Washington, DC..
Geologic Map of the Potomac River Gorge :[computer file]. great falls parks. Virginia, and part of the C&O canal national historical park, Maryland..
:
,
.
.
MLA Style
United States. Department of the Interior, Washington, DC..
Geologic Map of the Potomac River Gorge :[computer file]. great falls parks. Virginia, and part of the C&O canal national historical park, Maryland..
:
,
.
.
Turabian Style
United States. Department of the Interior, Washington, DC..
Geologic Map of the Potomac River Gorge :[computer file]. great falls parks. Virginia, and part of the C&O canal national historical park, Maryland..
:
,
.
.