"c           VAR 0685      01274 COALMAC 1A 891-944               MD= 1E-37   "
"c           REF 0685         LOC 2337 WIDTH  9             DK  37 COL 71-79  "
"c                                                                            "
"c                                                                            "
"c              BITUMINOUS COAL, NUMBER OF UNDERCUTTING MACHINES IN USE AT    "
"c              THE END OF THE YEAR                                           "
"c              ----------------------------------------------------------    "
"c                                                                            "
"c              NBER SERIES:  01274                                           "
"c              AREA COVERED:  U.S.                                           "
"c              UNITS:  NUMBER                                                "
"c              ANNUAL COVERAGE:  1891, 1896-1944                             "
"c              QUARTERLY COVERAGE:  NONE                                     "
"c              MONTHLY COVERAGE:  NONE                                       "
"c              SEASONAL ADJUSTMENT:  NONE                                    "
"c              SOURCE:  MINERAL RESOURCES OF THE U.S., 1923, 1927, 1929,     "
"c              1930, 1931; MINERALS YEARBOOK, 1932 AND FOLLOWING ISSUES.     "
"c                                                                            "
"c              NOTES:   DATA INCLUDE UNDERCUTTING MACHINES USED IN LIGNITE   "
"c              MINES.                                                        "
"c                                                                            "
"c              CHECKED MANUALLY; NO CORRECTIONS NECESSARY.                   "
"c                                                                            "
"c           ...............................................................  "
-1
1891.
1944.
545.000
NA
NA
NA
NA
1446.00
1956.00
2622.00
3125.00
3907.00
4341.00
5418.00
6658.00
7663.00
9184.00
10212.0
11144.0
11569.0
13049.0
13254.0
13829.0
15298.0
16379.0
16507.0
15692.0
16198.0
17235.0
18463.0
18959.0
19103.0
19618.0
20436.0
21229.0
18660.0
17551.0
17466.0
17388.0
15261.0
14731.0
14237.0
13216.0
12017.0
11845.0
11905.0
11881.0
11974.0
11392.0
11810.0
12227.0
11950.0
12608.0
13049.0
12924.0
13305.0