Title: Treatise on Invertebrate Paleontology
Subjects: Agnostida, Trilobites, Fossil Invertebrates, Redlichiida, Wirbellose, Paleontologie, Ongewervelde dieren, Paleozoologia, Paleontologia, Palaontologie, Paläontologie, Paleontology, Fossil Brachiopoda, Mollusques, Fossiles, Invertébrés, Gastéropodes, Chitons (mollusques), Scaphopodes, Fossil Arthropoda