Template:Hallbauer et al., 1977a

• Hallbauer, D.K., Jahns, H.M. & Beltman, H.A. 1977. Morphological and anatomical observations on some precambrian plants from the Witwatersrand, South Africa. Geologische Rundschau: International Journal of Earth Sciences 66(2): 477–491. DOI: 10.1007/BF01989590 . ResearchGate .  
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  • RLL List # 99 / Rec.# 7529 – Recent Literature on Lichens