Playing in the AL, Spanning Multiple Seasons or entire Careers, From 1930 to 1939, (requiring At least 1200 Innings Pitched), sorted by smallest ERA

  Cnt Player              **ERA**    IP   From  To   Ages   G   GS  CG SHO  GF  W   L   W-L%  SV   H    R   ER   BB   SO  ERA   HR   BF  IBB HBP  BK  WP Teams
 ----+-----------------+----------+------+----+----+-----+----+---+---+---+---+---+---+-----+---+----+----+----+----+----+----+---+-----+---+---+---+---+----------- 
    1 Lefty Grove           2.91   2399   1930 1939 30-39  351 268 197  26  72 199  76  .724  31 2344  907  776  639 1313  161  93 10054      22   0  16 PHA-BOS     
    2 Lefty Gomez           3.24   2234.2 1930 1939 21-30  322 278 163  26  28 165  89  .650   9 2031  949  804  904 1337  130 122  9505      15   0  30 NYY         
    3 Red Ruffing           3.59   2439   1930 1939 25-34  334 298 201  28  31 175  98  .641   8 2327 1123  972  858 1260  119 150 10351      24   5  24 TOT-NYY     
    4 Johnny Allen          3.73   1406.1 1932 1939 27-34  212 182  94  12  22 108  45  .706   6 1323  654  583  547  838  118  66  5970      27   3  50 NYY-CLE     
    5 Mel Harder            3.74   2326   1930 1939 20-29  385 285 134  16  72 158 123  .562  21 2557 1168  967  692  812  124 101 10102      41   1  22 CLE         
    6 Tommy Bridges         3.76   2083   1930 1939 23-32  309 266 156  25  32 150 102  .595   8 2015 1021  870  902 1207  123 138  9033      29   7  41 DET         
    7 Ted Lyons             3.90   1972   1930 1939 29-38  278 237 168   9  34 117 115  .504   5 2203 1038  855  525  536  118 130  8501      15   4  24 CHW         
    8 Monte Pearson         4.00   1295.2 1932 1939 23-30  201 171  86   4  21  92  53  .634   4 1262  658  576  681  652  113  71  5687       6   1  40 CLE-NYY     
    9 Wes Ferrell           4.08   2345.1 1930 1939 22-31  323 293 207  16  28 170 115  .596   8 2554 1251 1062  911  867  116 124 10347      18   3  32 CLE-BOS-TOT-NYY 
   10 Lloyd Brown           4.16   1317   1930 1937 25-32  302 149  67   9  96  78  88  .470  17 1464  719  609  440  385  108  65  5719      17   0  37 WSH-TOT-CLE 
   11 Alvin Crowder         4.16   1592.2 1930 1936 31-37  266 196 100   8  43 115  79  .593  12 1717  818  737  472  543  104  94  6837      10   1  14 TOT-WSH-DET 
   12 Lefty Stewart         4.18   1265   1930 1935 29-34  195 162  81   6  21  77  72  .517   3 1378  689  588  369  384  110  94  5437      10   3   5 SLB-WSH-TOT 
   13 Bump Hadley           4.21   2121.2 1930 1939 25-34  374 257  98  10  78 121 119  .504  20 2127 1147  992 1061 1006  109 133  9372      38   3  50 WSH-TOT-SLB-WSH-NYY 
   14 Vic Sorrell           4.25   1274.2 1930 1937 29-36  215 162  74   7  34  70  75  .483   9 1368  691  602  517  471  108  77  5600      13   0  17 DET         
   15 Clint Brown           4.35   1309   1930 1939 26-35  344 128  60   8 177  81  80  .503  49 1540  746  632  314  358  108  74  5725      16   0  17 CLE-CHW     
   16 Oral Hildebrand       4.39   1411.1 1931 1939 24-32  245 182  80   9  43  82  77  .516  13 1471  774  688  609  522  107  98  6225      21   1  21 CLE-SLB-NYY 
   17 Elden Auker           4.40   1234.2 1933 1939 22-28  226 161  76  10  39  86  62  .581   2 1390  695  603  439  394  105  76  5438      29   1   7 DET-BOS     
   18 Bobo Newsom           4.40   1685.2 1934 1939 26-31  251 213 129  12  26 100  94  .515  13 1704  929  824  877  962  109 106  7464      22   4  31 SLB-TOT-WSH-SLB 
   19 Rube Walberg          4.45   1421.2 1930 1937 33-40  293 159  74   7  79  80  74  .519  14 1545  803  703  569  547  104  79  6271      10   0  25 PHA-BOS     
   20 Earl Whitehill        4.50   2040   1930 1938 31-39  293 271 132   7  15 127 100  .559   4 2276 1161 1021  841  741  100 126  9066      49   2  33 DET-WSH-CLE 
   21 George Blaeholder     4.58   1467   1930 1936 26-32  255 200  83   9  36  80  94  .460   7 1734  871  747  417  410  105 128  6448       9   2   8 SLB-TOT-CLE 
   22 Willis Hudlin         4.61   1736.1 1930 1939 24-33  338 225 101   8  69 105 106  .498  23 2053 1040  889  571  461  100  87  7714      21   5  27 CLE         

Seasons/Careers found: 22.

 Photos from the George Grantham Bain Collection at the Library of Congress.