The hissing of some, errr, old records

My friend Jim brought over some Freddie Slack 78’s so I could burn them to CD for him. Here’s a couple of the songs. Any ideas how I can reduce the hissing? I’m sure Jim would appreciate it. Thanks!

Oh, yeah, something about the music. I’ve never heard a bad song by Freddie Slack. He was a drummer turned piano player that lead a fine band in the forties. That’s his band playing on Ella Mae Morse’s great “Cow-Cow Boogie”. Mosaic has a 3-CD set of Slack's records (including the ones that Jim brought over) that looks terrific.