Mine happens to be Lyman 45.... and I have them going back to Lyman 43 in think up to date. and every other bullet/powder manufacturers manual as well.
I've gone through 3 Lyman 45's so far in the last 50 years,,, as they fall apart, (the weakness with this book) I have been lucky enough to find a replacement in good shape..
So whats your go-to manual?