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On the chromatology of some British sponges (1888)
MacMunn, Charles Alexander, 1852-1911, Royal College of Surgeons of England · [London : s.n.] · leaf 31
JOURN. PHYSIOLOGY VUL IX PLATE IPigments, Biological · Porifera
Internet Archive · Royal College of Surgeons of England · Public domain (published before 1931). Free to use for anything.
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