Add 23b using the "Add New hymn text instance" link in the left side bar, or upload another spreadsheet.
I don't appear to have saved a copy. Here is a scan of the page in question, though: https://hymnary.org/files/hymnary/image/23.jpg
Can you send me the spreadsheet?
Thanks for figuring out what the problem was and fixing it!
According to the information we have, DAMBUSTER'S MARCH is copyrighted by Warner/Chappell Music Ltd. We have a list of 8 hymnals under Instances where the music may be found. Otherwise, you can try contacting the copyright holder/publsher, to see if they sell the music. If you enclose the first line with quotation marks in your search, you will more easliy be able to find what you are looking for; otherwise, you are searching for hymns with these words in any order.