I think Big Beat Steve is saying that Rust lists relatively contemporary 78 issues as well as some first issues that were on LP. Rust generally does not list LP reissues (unless it's the first issue of the material).
I have many editions of Rust. The most recent issue (now apparently out of print in book form) was something of a disappointment. It lacked an index (you had to buy it separately, with the result that it is not bound with the main body of the discography). In addition, the layout was changed (in my mind, not for the better). I find the 4th and 5th editions easier to use.