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Map of Gabbros Area in Delaware in "The Gabbros and Associated Rocks in Delaware" by FD Chester in Bulletin No. 59 of the USGS, 1890. Scale 1"=3miles. Colour print, 9"x11.5"

Map of Gabbros Area in Delaware in "The Gabbros and Associated Rocks in Delaware" by FD Chester in Bulletin No. 59 of the USGS, 1890. Scale 1"=3miles. Colour print, 9"x11.5"

USGS Delaware

Map of Gabbros Area in Delaware in "The Gabbros and Associated Rocks in Delaware" by FD Chester in Bulletin No. 59 of the USGS, 1890. Scale 1"=3miles. Colour print, 9"x11.5", folding out from 45 pp report. Colours are 5 shades of brown on black base map. In good condition.