Newscopy: "Some 100 interviewers from the WPA's division of research are ringing doorbells these days and asking San Francisco residents what jobs they have now, what they held previously and other questions regarding their employment records. It's a survey of the labor arket, an analysis of the experiences of 13,000 typical San Francisco families. Findings will be sent to Washington after the survey ends April 6, and will be available there to governmental and private officals who need information on employment condi- [cuts off]"