Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Whether it multiplied the farms among the Italians in the same proportion maybe doubted; at any rate what it did accomplish yielded a great and beneficent result. It is true that this result was not achieved without various violations of respectable interests and existing rights.
The allotment-commission, composed of the most decided partisans, and absolute judge in its own cause, proceeded with its labours in a reckless and even tumultuary fashion; public notices summoned every one, who was able, to give information regarding the extent of the domain-lands; the old land-registers were inexorably referred to, and not only was occupation new and old revoked without distinction, but in various cases real private property, as to which the holder was unable satisfactorily to prove his tenure, was included in the confiscation.
Loud and for the most part well founded as were the complaints, the senate allowed the distributors to pursue their course; it was clear that, if the domain question was to be settled at all, the matter could not be carried through without such unceremonious vigour of action.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=4