"c VAR 0855 02131 RFNG SHP R 919-928 MD= 1E-37 " "c REF 0855 LOC 2617 WIDTH 9 DK 42 COL 44-52 " "c " "c " "c PREPARED ROOFING SHIPMENTS, ORIGINAL DATA " "c ----------------------------------------- " "c " "c NBER SERIES: 02131 " "c AREA COVERED: UNITED STATES " "c UNITS: THOUSANDS OF ROOF SQUARES " "c ANNUAL COVERAGE: NONE " "c QUARTERLY COVERAGE: NONE " "c MONTHLY COVERAGE: 1/1919 - 9/1928 " "c SEASONAL ADJUSTMENT: NONE " "c SOURCE: 1919-28:"SURVEY OF CURRENT BUSINESS", SEPT. 1923, " "c P. 55 AND LATER ISSUES; 1928-43: BUREAU OF THE CENSUS " "c RELEASES ON ASPHALT PREPARED ROOFING EXCEPT 1932 OF THIRD " "c SEGMENT WHICH IS FROM"SURVEY OF CURRENT BUSINESS, 1936 " "c SUPPLEMENT" " "c " "c NOTES: SERIES 02131 HAS BEEN SUBDIVIDED INTO 3 VARIABLES: " "c (1) V855 -- ORIGINAL DATA, 1919-1928; (2) V856 -- ORIGINAL " "c DATA, 1928-1934; (3) V857 -- ORIGINAL DATA, 1932-1943. " "c 1919-28: PRORATED TO 100% OF INDUSTRY FROM 60-90%; " "c 1928-34: DATA COVER 40 IDENTICAL MANUFACTURERS COMPRISING " "c PRACTICALLY ENTIRE INDUSTRY; 1932-43: COVERAGE VARIED FROM " "c 23 TO 32 COMPANIES (85-95% OF INDUSTRY). " "c " "c CHECKED MANUALLY; NO CORRECTIONS NECESSARY. " "c " "c ............................................................... "