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2. A new Ordovician–Silurian boundary section in San Juan Province, Argentina, and its definitive graptolite fauna
3. Lagarograptus rickardsi sp. nov. from the Silurian (Llandovery) of Saudi Arabia;El-Khayal;Journal of the College of Science, King Saud University,1987
4. Elles G. L. Wood E. M. R. 1901–18. A monograph of British Graptolites. Edited by Lapworth C. London, Monograph of the Palaeontographical Society, London, (1) 1901, 1–54, pls 1–4; (2) 1902, i–xxviii. 55–102, pls 5–13; (3) 1903, xxx–lii, 103–34, pls 14–19; (4) 1904 liii–lxxii, 135–80, pls 20–25; (5) 1906, lxxiii–xcvi, 181–216, pls 26–27; (6) 1907, xcvii–cxx, 217–72, pls 28–31; (7) 1908, cxxi–cxlviii, 273–358, pls 33–35; (8) 1911, 359–414, pls 36–41; (9) 1913, 415–86 pls 42–49; (10) 1914, 487–526, pls 50–52; (11) 1918, a–m, cxlix–clxxi, 527–39.
5. A redescription of the Llandoverian monograptid “Graptolithus” tenuis, Portlock, 1843