All the volumes of The English and Scottish Popular Ballads (1882-1898) are available at Internet Archive.

The English and Scottish popular ballads (Volume 1, part 1) [nos. 1-28]
The English and Scottish popular ballads (Volume 1, part 2) [nos. 29-53]
The English and Scottish popular ballads (Volume 2, part 4) [nos. 83-113]
The English and Scottish popular ballads (Volume 3, part 5) [nos. 114-155]
The English and Scottish popular ballads (Volume 3, part 6) [nos. 156-188]
The English and Scottish popular ballads (Volume 4, part 7) [nos. 189-225]
The English and Scottish popular ballads (Volume 4, part 8) [nos. 226-265]
The English and Scottish popular ballads (Volume 5, part 10) [Additions etc.]
The English And Scottish Popular Ballads (Vol. I, pts. 1-4) (rpt. Folklore Press/Pageant Book Company, 1956) [nos. 1-113]
The English And Scottish Popular Ballads (Vol. V, pts. 9-10) (rpt. Folklore Press/Pageant Book Company, 1956) [nos. 266-305, and additions]

Helen Child Sargent and George Lyman Kittredge, eds., English and Scottish Popular Ballads (1904)