_Research Report No._ 13. REST PERIODS FOR INDUSTRIAL WORKERS. 55 pages. January, 1919. $1.00. _Research Report No._ 14. WARTIME CHANGES IN THE COST OF LIVING--JULY, 1914, TO NOVEMBER, 1918. 33 pages. February, 1919. 75 cents. _Research Report No._ 15. PROBLEMS OF INDUSTRIAL READJUSTMENT IN THE UNITED STATES. 58 pages. February, 1919. $1.00. _Research Report No._ 16. HOURS OF WORK AS RELATED TO OUTPUT AND HEALTH OF WORKERS--SILK MANUFACTURING. 54 pages. March, 1919. $1.00. _Research Report No._ 17. WARTIME CHANGES IN THE COST OF LIVING--JULY, 1914, TO MARCH, 1919. 31 pages. May, 1919. 75 cents. _Research Report No._ 18. HOURS OF WORK AS RELATED TO OUTPUT AND HEALTH OF WORKERS--METAL MANUFACTURING INDUSTRIES. 62 pages. July, 1919. $1.00. _Research Report No._ 19. CHANGES IN THE COST OF LIVING--JULY, 1914, TO JULY, 1919, 31 pages. September, 1919.75 cents. _Research Report. No._ 20. WARTIME CHANGES IN WAGES--(SEPTEMBER, 1914,--MARCH, 1919). 128 pages. September, 1919. $1.50. _Research Report No._ 21. WORKS COUNCILS IN THE UNITED STATES. 135 pages. October, 1919. $1.50. _Research Report No._ 22. THE COST OF LIVING AMONG WAGE-EARNERS--FALL RIVER, MASSACHUSETTS, OCTOBER, 1919. 18 pages. November, 1919. 50 cents. _Research Report No._ 23. CONCILIATION AND ARBITRATION IN NEW ZEALAND. 46 pages. December, 1919. $1.00. _Research Report No._ 24. THE COST OF LIVING AMONG WAGE-EARNERS--LAWRENCE, MASSACHUSETTS, NOVEMBER, 1919. 21 pages. December, 1919. 50 cents. _Research Report No._ 25. CHANGES IN THE COST OF LIVING--JULY, 1914, TO NOVEMBER, 1919. 24 pages. December, 1919. 75 cents. _Research Report No._ 26. A WORKS COUNCIL MANUAL. 32 Pages. February, 1920. $1.00. RESEARCH REPORTS IN PREPARATION CONCILIATION AND ARBITRATION IN FRANCE. FEDERAL AND STATE AGENCIES OF CONCILIATION AND ARBITRATION IN THE UNITED STATES. HOURS OF WORK AS RELATED TO OUTPUT AND HEALTH OF WORKERS. SUMMARY OF RESEARCH REPORTS NOS. 4, 7, 12, 16 AND 18, WITH ADDITIONAL MATERIAL. EXTENT AND CAUSES OF ABSENCE AMONG INDUSTRIAL WORKERS. INDUSTRIAL NEWS SURVEY Important industrial news in concise form. Weekly. $2.00 per year