NixonâFord Friendship Seems Strained
There are strong indications that personal and pol friendship between Pres Nixon and Vice Pres Ford has begun to unravel although neither man will say publicly that relations are strained; Ford has made clear that they disagree over White House's refusal to turn over additional tapes and other material to HR Judiciary Com; Ford discusses his meetings with Nixon; Ford's defense of Pres Nixon and his views on Watergate discussed (M)