Gwelliant Llanwnda i fan i'r de o Lanllyfni A487 : datganiad amgylcheddol : crynodeb annhechnegol = A487 Llanwnda to south of Llanllyfni improvement : environmental statement : non-technical summary.
Great Britain.Welsh Office.Highways Directorate.
[Cardiff : Welsh Office Highways Directorate,
1997].
Roads