MORE PLANTS CLOSING
NJ officials assert that 350,000 to 400,000 workers will be out of work by Jan 31 as result of factory and business closing because of cold weather and gas shortage; warn there may be 700,000 layoffs by end of wk; NYS PSC repts more than 100,000 layoffs are expected tomorrow, bringing to more than 200,000 total number of workers who have lost jobs since onset of gas shortages; gas cutoff ordered by Con Ed is expected to affect upward of 10,000 workers at 475 major industries and businesses; layoffs anticipated in NYS include 50,000 to 80,000 employees of businesses and industries in Bklyn, Queens and Staten Is whose gas supplies were cut off by Bklyn Union Gas Co (M)