August 1, 1976

16 NYC policemen are burned, 5 seriously, by mixture containing large quantity of lye thrown at them by Calvin Heyward when they try to arrest him in his barricaded apt at 12 Convent Av in Harlem; Hey ward, a former convict, now sought for stabbing of fellow tenant, John McCoy, is killed in fray, reptdly by Officer Douglas Brussel; most seriously burned are Sgts Murray Shapiro, Richard Reichman, Officers Joseph Bocasi, Howard Blackmore and Eddie Mansfield (M)

FBI ordered to return documents stolen from Socialist Workers Party hq in Denver 3 wks ago, allegedly by bur informer Timothy Redfearn; inclusion of documents in 2,000 pgs of files relating to Redfearn appears to contradict assertions by bur agent John V Almon that he had refused to accept stolen documents when Redfearn offered them to him on July 7; bur files on Redfearn, tracing 5-yr, off-and-on career as paid bur informer assigned to rept on Socialist Workers, seen providing 1st detailed picture of nature and scope of intelligence that bur collected on radical pol orgns in Amer; show that less than mo after Redfearn burglarized Socialist Workers in '73, bur's Washington-based inspection staff rated his performance 'excellent'; files show agent Boyd D Adsit, now retired, recd other stolen documents from Redfearn in late '73, and make clear that bur continued to employ Redfearn after learning in '75 that he had, on his own, stolen $20,000 worth of guns and electronic equipment from Denver home; Fed and local investigations of bur's activity in Denver are focusing on its 8-day delay in telling Denver police about July 7 burglary (L)

article says hostile reaction to Reagan's selection of Schweiker Repub Party's prevailing opinion of its liberal members (M)

Article notes that farmers now are turning to ecologically based concept of pest control that is expected eventually to dominate world agr; concept, called pest mgt, is system of restricting numbers of pests so injury they cause will not result in significant econ losses; pest mgt relies heavily on understanding complex biological and environmental relationships that together determine pest's ability to cause crop damage; several scientists and farmers comment; illus (L)

Viking lander detects unexpected abundance of oxygen and chem activity in Mars soil; findings held inconclusive since spacecraft's instruments could have released oxygen, causing reactions that mimic biological activity (M)