which al player was the first with 15 rbi in a month

Ty Cobb drove in 17 runs in the AL in May 1920.

Interpreted as:

Which al player was the first with 15 or more rbi in a month?

	NAME	MONTH	RBI	G	AB	R	H	2B	3B	HR	BB	HBP	SO	SB	PA	TB	XBH	SH	AVG	OBP	SLG	OPS
1	Ty Cobb T. Cobb	May 1920	17	25	91	17	30	5	2	1	14	1	7	4	109	42	8	3	.330	.425	.462	.886
2	Frank Ellerbe F. Ellerbe	May 1920	16	23	85	13	27	2	0	0	11	0	2	2	101	29	2	5	.318	.396	.341	.737
3	Happy Felsch H. Felsch	May 1920	25	29	115	21	41	8	3	6	10	3	5	3	130	73	17	2	.357	.422	.635	1.057
4	Larry Gardner L. Gardner	May 1920	26	26	101	11	28	8	1	1	8	0	4	3	115	41	10	6	.277	.330	.406	.736
5	Bucky Harris B. Harris	May 1920	23	26	102	20	27	4	2	0	6	4	10	7	121	35	6	9	.265	.330	.343	.673
6	Harry Heilmann H. Heilmann	May 1920	17	25	91	11	30	3	0	2	7	0	4	1	102	39	5	4	.330	.378	.429	.806
7	Tim Hendryx T. Hendryx	May 1920	17	24	89	13	30	4	1	0	5	1	9	1	99	36	5	4	.337	.379	.404	.783
8	Joe Jackson J. Jackson	May 1920	19	25	106	12	34	7	4	0	7	0	1	1	116	49	11	3	.321	.363	.462	.825
9	Baby Doll Jacobson B. Doll Jacobson	May 1920	15	27	97	14	34	4	3	3	12	0	5	2	113	53	10	4	.351	.422	.546	.968
10	Doc Johnston D. Johnston	May 1920	21	26	96	9	32	5	2	0	2	2	8	1	103	41	7	3	.333	.360	.427	.787
11	Joe Judge J. Judge	May 1920	15	26	108	26	46	3	3	1	14	0	1	3	124	58	7	2	.426	.492	.537	1.029
12	Duffy Lewis D. Lewis	May 1920	16	27	101	12	28	2	0	2	2	0	10	0	107	36	4	4	.277	.291	.356	.648
13	Del Pratt D. Pratt	May 1920	15	27	95	12	28	6	0	0	7	0	5	4	107	34	6	5	.295	.343	.358	.701
14	Sam Rice S. Rice	May 1920	16	26	107	19	34	7	0	0	10	1	2	13	122	41	7	4	.318	.381	.383	.765
15	Braggo Roth B. Roth	May 1920	18	26	89	25	31	4	0	0	25	3	8	9	118	35	4	1	.348	.504	.393	.898
16	Babe Ruth B. Ruth	May 1920	26	23	76	25	25	5	2	12	18	1	12	2	95	70	19	0	.329	.463	.921	1.384
17	Red Shannon R. Shannon	May 1920	18	25	96	12	32	3	3	0	9	0	11	0	108	41	6	3	.333	.390	.427	.818
18	George Sisler G. Sisler	May 1920	15	27	110	13	39	6	0	1	4	0	5	9	118	48	7	4	.355	.377	.436	.814
19	Elmer Smith E. Smith	May 1920	15	21	69	12	19	3	0	2	6	0	8	0	77	28	5	2	.275	.333	.406	.739
20	Tristram Speaker T. Speaker	May 1920	29	26	97	27	38	10	2	3	18	1	2	2	120	61	15	4	.392	.491	.629	1.120
21	Tilly Walker T. Walker	May 1920	19	28	113	16	32	4	1	4	4	2	11	1	124	50	9	5	.283	.319	.442	.762
22	Buck Weaver B. Weaver	May 1920	19	29	132	19	43	8	0	0	8	0	10	2	141	51	8	1	.326	.364	.386	.751
23	Ping Bodie P. Bodie	June 1920	28	29	108	22	36	4	3	4	13	0	4	1	124	58	11	3	.333	.405	.537	.942
24	Larry Gardner L. Gardner	June 1920	26	28	109	11	38	4	2	0	10	0	4	0	125	46	6	6	.349	.403	.422	.825
25	Harry Heilmann H. Heilmann	June 1920	16	27	101	15	30	7	0	2	7	0	8	0	110	43	9	2	.297	.343	.426	.768