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Keywords: Tetragraptus approximatus 1.png en Tetragraptus approximatus Top fragment of one of the stypes magnified Bottom Nearly perfect specimen 1873 Henry Alleyne Nicholson 1873 On some Fossils from the Quebec Group of Point Lévis Quebec The Annals and Magazine of Natural History including Zoology Botany and Geology 4th Series 11 133 “143 Henry Alleyne Nicholson PD-Old Uploaded with UploadWizard Tetragraptus approximatus |