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High Rock Observatory, near Pen Mar Park, view looking west, Maryland, between 1900 and 1910. Creator: Unknown.
HRM23A47_122

High Rock Observatory, near Pen Mar Park, view loo...

High Rock Observatory, near Pen Mar Park, Maryland, between 1900 and 1910. Creator: Unknown.
HRM23A47_121

High Rock Observatory, near Pen Mar Park, Maryland...

'High Banks, Portage', 1874. Creator: John Filmer.
HRM19F28_097

'High Banks, Portage', 1874. Creator: John Filmer.