(Dyffryn Dyfi) (Unclassified).
Grid Reference: SH 85945 12996. Parish: Mallwyd, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

(Dyffryn Dyfi) (Unclassified).
Grid Reference: SH 78664 02973. Parish: Darowen, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Dyffryn (Unclassified).
Grid Reference: SH 63243 10052. Parish: Llanegryn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Dyffryn (Unclassified).
Grid Reference: SN 59039 99259. Parish: Tywyn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Dyffryn (Unclassified).
Grid Reference: SH 86624 64576. Parish: Llangernyw, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Dyffryn -gwyn (Unclassified).
Grid Reference: SN 62494 98390. Parish: Tywyn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Dyffryn-gall (Unclassified).
Grid Reference: SH 85602 64655. Parish: Llangernyw, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Dyffryn-gall (Unclassified).
Grid Reference: SH 83637 63836. Parish: Maenan, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Dyffryn-gwyn (Unclassified).
Grid Reference: SN 59053 99268. Parish: Tywyn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Dyffryn-gwyn (Unclassified).
Grid Reference: SN 64753 99240. Parish: Tywyn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website