Playford, 1963
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Playford, G., 1963: Lower Carboniferous microfloras of Spitsbergen - part two. Palaeontology, v.5, no.4, p.619-678, pl.88-95.
Playford, G., 1963: Lower Carboniferous microfloras of Spitsbergen - part two. Palaeontology, v.5, no.4, p.619-678, pl.88-95.
