The article https://en.numista.com/catalogue/pieces2447.html
in the year distribution section gives
1975 10,000,000 Llantrisant Mint
1975 60,190,000 US Mint
for the same year 1975 two different lines. There is no indication about how to distinguish them neither in comments section, no in the comment of the lines.
If there is no way to find the difference it is a must not to confuse collectors with these personal notes at all.
It is recommended:
1. to create a comment in Comments section, something like that
The business strike of 1975 was produced by Franklin mint in 60,190,000 and by Llantrisant Mint in 10,000,000 pieces. Till now there is no way to distinguish them.
2. in Mintage section (year distribution) to unify both lines in one:
1975 70,190,000