Of course there's all sorts of information out there on many of those old bulls. I've mentioned on this site several times the ASA sire tests of the mid to late 70's. Nearly all of the bulls tested were either straight beef, straight dual, or a combination of the two. Irish influence had not become extremely popular yet. I believe there were about 25 bulls compared the year my bull was in the test. The ASA has got to have this information somewhere. I know it was published in the Shorthorn magazines of the day. The test basically ran from conception to carcass. My old ABS sire books also have performance information on the progeny of all their bulls, as do the other AI magazines I have. The ABS issue I look at the most has performance data on progeny of Leader 21, Leader 9, Merriwong Smuggler, Lone Pine Grand Society, and there's another Australian bull I can't remember. Unfortunately, most of this data has been neglected for many years. It's out there.