1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
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1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
1960. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
1961. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
1960. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.
1960. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.