File:Geologic Map of Cape Ann, Mass., Showing Distribution of Dikes, etc., 1887.jpg
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![File:Geologic Map of Cape Ann, Mass., Showing Distribution of Dikes, etc., 1887.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/Geologic_Map_of_Cape_Ann%2C_Mass.%2C_Showing_Distribution_of_Dikes%2C_etc.%2C_1887.jpg/614px-Geologic_Map_of_Cape_Ann%2C_Mass.%2C_Showing_Distribution_of_Dikes%2C_etc.%2C_1887.jpg?20210903183146)
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