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MGS Baltimore County Plate VI Figure 2.jpg - Jstuby
Porpidia albocaerulescens.jpg - Ed Uebel~commonswiki
Flickr - Nicholas T - Apollo County Park (6).jpg - Matanya
Chlorite schist (Wissahickon Schist, Neoproterozoic to Cambrian; Jarrettsville, Maryland, USA) (16735383710).jpg - Ser Amantio di Nicolao
Wissahickon Formation metagreywacke 20220616.jpg - Jstuby
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