MAIN STREET, U.S.S.R. (408 pp.)Irving R. LevineDoubleday ($4.50).
THE PRIVILEGE WAS MINE (318 pp.)Princess Zinaida SchakovskoyPutnam ($4).
Of these two new books about present-day Russia, one is an information-packed Baedeker; the other is a cry from the heart. Correspondent Levine. who for the past three years has broadcast from Moscow for NBC. got the idea for his volume from a weekly radio program in which he answered questions sent in by U.S. listeners. (Sample: Are there chiropractors in the U.S.S.R.? Answer: No, but chiropractic techniques are used.) Like a less history-conscious Gunther. Author...