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Hepper, F.N. 1954. Flora of Caldey Island, Pembrokeshire. Proc. BSBI 1, 21-36; pdf 5.18Mb
Walters, S.M. 1954. The Distribution Maps Scheme. Proc. BSBI 1, 121-130; pdf 1.27Mb.
Webb, D.A. 1955. The Distribution Maps Scheme: a Provisional Extension to Ireland of the British National Grid. Proc. BSBI 1, 316-319; pdf 439kb.
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