DEAN TELLS PLAN TO SAVE HIMSELF
John W Dean 3d admits on Oct 23 after repeated questioning by ex-Atty Gen J N Mitchell's atty William G Hundley that to save himself he had joined in plan to have Mitchell take blame for Watergate break-in; says he did so even though he had no evidence that Mitchell had approved bugging plan that led to break-in; Dean admits to various mistakes in testimony that he gave at Sen Watergate com hearings in '72; essentially, mistakes involved Dean's giving inaccurate dates for some of meetings with Nixon, particularly statements that he had attributed to meetings on Feb 27 and Mar 13; day is marked by series of heated arguments between lawyers for prosecution, lawyers for defense and, often, Judge John J Sirica; chief prosecutor James F Neal tells ct that a number of Govt witnesses, not including Dean, might be giving accounts that are only 75% or 85% true; Sirica says former Pres Nixon might be called as 'ct witness' rather than as witness for any of parties, a legal procedure in which nobody would have to vouch for his credibility; courtroom sketches of defense atty John J Wilson and of Sirica (L)