Ira D. Sankey’s 1873 music collection Sacred Songs and Solos contains the hymn “There is a land mine eyes have seen.” The index lists this as:

‘There is a land mine’

In the Sunday Times, March 15, 1964, F.N. Scaife recalls seeing a similarly odd entry in an old hymn book. The first lines of the hymn were:

O Lord, what boots it to recall
The hours of anguish spent

This was indexed as:

‘O Lord, what boots’