Early 20th century, L.E.M. Jones.
I love the C for the creative use of the ocean. I love the Y for the cows. I love the cottage and cottager hidden mid-Z, as well as the little pond at the bottom of the hill.
These can be found at the British Museum. Just click on a letter to see it up close. Their description is brief: "Series of 26 landscape scenes shaped as letters of the alphabet; rebound in a 20th-century binding."