Finding the longest contiguous maxam-gilbert sequence ever

[jmsc1]

I'm trying to find the longest contiguous sequence ever established using the maxam-gilbert (chemical degradation) method. I've found no references to this in literature. The only other way I can think of to do it would be to filter something like the ncbi nucleotide database to show only sequences that used this method and then sort by length, but if that's possible I can't figure out how to do it. Please help.