Bucky Walters had the lowest ERA in the NL in 1939, with an ERA of 2.29.

Interpreted as:

Who had the best era with a minimum of 1 IP per team game in the nl in 1939?

	NAME	ERA	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Bucky Walters B. Walters	2.29	1939	CIN	39	27	11	.711	36	137	31	2	0	319.0	250	81	98	15	109	6	2	1,283	8	3.87	3.08	1.26	0.42	10.7	8.5	1.13	.231	2.76	60	3.81	96	7.05	4.8
2	Bob Bowman B. Bowman	2.60	1939	SLN	51	13	5	.722	15	78	4	2	8	169.1	141	49	54	8	60	1	19	692	3	4.15	3.19	1.30	0.43	11.3	8.7	1.19	.244	2.87	63	3.75	87	7.49	10.2
3	Carl Hubbell C. Hubbell	2.75	1939	NYG	29	11	9	.550	18	62	10	0	2	154.0	150	47	60	11	24	2	8	639	2	3.62	1.40	2.58	0.64	9.7	3.8	1.13	.257	3.51	69	3.60	87	8.77	8.9
4	Hugh Casey H. Casey	2.93	1939	BKN	40	15	10	.600	25	79	15	0	1	227.1	228	74	88	13	54	11	11	962	4	3.13	2.14	1.46	0.51	8.2	5.6	1.24	.267	3.48	73	3.88	92	9.03	8.4
5	Paul Derringer P. Derringer	2.93	1939	CIN	38	25	7	.781	35	128	28	5	0	301.0	321	98	115	15	35	3	1	1,245	2	3.83	1.05	3.66	0.45	10.3	2.8	1.18	.288	3.44	77	3.15	80	9.60	27.2
6	Milt Shoffner M. Shoffner	3.18	1939	TOT	35	6	8	.429	14	57	7	0	1	170.0	176	60	74	7	53	3	12	729	1	3.02	2.81	1.08	0.37	7.8	7.3	1.35	.278	3.92	86	3.83	100	9.32	-0.6
7	Mort Cooper M. Cooper	3.25	1939	SLN	45	12	6	.667	26	130	7	2	5	210.2	208	76	94	6	97	2	12	919	4	5.55	4.14	1.34	0.26	14.1	10.6	1.45	.295	4.02	79	3.52	82	8.89	17.7
8	Claude Passeau C. Passeau	3.28	1939	TOT	42	15	13	.536	35	137	17	2	3	274.1	269	100	112	9	73	5	6	1,150	0	4.49	2.39	1.88	0.30	11.9	6.3	1.25	.281	3.67	84	3.25	80	8.83	25.2
9	Larry French L. French	3.29	1939	CHC	36	15	8	.652	21	98	10	2	1	194.0	205	71	80	7	50	1	11	828	5	4.55	2.32	1.96	0.32	11.8	6.0	1.31	.295	3.71	84	3.22	79	9.51	18.5
10	Mace Brown M. Brown	3.37	1939	PIT	47	9	13	.409	19	71	8	1	7	200.1	232	75	90	8	52	2	18	872	3	3.19	2.34	1.37	0.36	8.1	6.0	1.42	.303	4.04	86	3.59	88	10.42	10.8
11	Bill Lee B. Lee	3.44	1939	CHC	37	19	15	.559	36	105	20	1	0	282.1	295	108	125	18	85	1	1	1,202	4	3.35	2.71	1.24	0.57	8.7	7.1	1.35	.279	3.98	88	3.97	97	9.40	3.4
12	Whitey Moore W. Moore	3.45	1939	CIN	42	13	12	.520	24	81	9	2	3	187.2	177	72	88	10	95	6	11	819	3	3.88	4.56	0.85	0.48	9.9	11.6	1.45	.266	4.22	91	4.42	112	8.49	-10.3
13	Cliff Melton C. Melton	3.56	1939	NYG	41	12	15	.444	23	95	9	2	5	207.1	214	82	94	7	65	4	13	886	2	4.12	2.82	1.46	0.30	10.7	7.3	1.35	.290	4.08	90	3.49	85	9.29	14.4
14	Curt Davis C. Davis	3.63	1939	SLN	49	22	16	.579	31	70	13	3	7	248.0	279	100	121	18	48	3	14	1,059	2	2.54	1.74	1.46	0.65	6.6	4.5	1.32	.284	4.39	88	3.97	93	10.13	9.1
15	Luke Hamlin L. Hamlin	3.64	1939	BKN	40	20	13	.606	36	88	19	2	0	269.2	255	109	115	27	54	0	2	1,100	2	2.94	1.80	1.63	0.90	8.0	4.9	1.15	.245	3.84	90	4.22	101	8.51	-0.1
16	Lon Warneke L. Warneke	3.78	1939	SLN	34	13	7	.650	21	59	6	2	2	162.0	160	68	73	14	49	2	7	675	2	3.28	2.72	1.20	0.78	8.7	7.3	1.29	.265	4.06	92	4.31	101	8.89	0
17	Bill McGee B. McGee	3.81	1939	SLN	43	12	5	.706	17	56	5	4	0	156.0	155	66	68	14	59	0	9	660	2	3.23	3.40	0.95	0.81	8.5	8.9	1.37	.266	3.92	93	4.56	106	8.94	-4
18	Danny MacFayden D. MacFayden	3.90	1939	BSN	33	8	14	.364	28	46	8	0	2	191.2	221	83	100	11	59	4	3	846	2	2.16	2.77	0.78	0.52	5.4	7.0	1.46	.289	4.70	107	4.22	111	10.38	-10.9
19	Bill Posedel B. Posedel	3.92	1939	BSN	33	15	13	.536	29	73	18	5	0	220.2	221	96	103	8	78	0	3	927	1	2.98	3.18	0.94	0.33	7.9	8.4	1.35	.277	4.20	108	3.84	101	9.01	-2.5
20	Charlie Root C. Root	4.03	1939	CHC	35	8	8	.500	16	65	8	0	4	167.1	189	75	83	11	34	2	12	709	0	3.50	1.83	1.91	0.59	9.2	4.8	1.33	.298	4.46	103	3.70	91	10.17	7.1
21	Bill Lohrman B. Lohrman	4.07	1939	NYG	38	12	13	.480	24	70	9	1	1	185.2	200	84	91	15	45	3	7	769	5	3.39	2.18	1.56	0.73	9.1	5.9	1.32	.291	4.41	103	4.04	98	9.69	1.7
22	Rip Sewell R. Sewell	4.08	1939	PIT	52	10	9	.526	12	69	5	1	2	176.1	177	80	93	10	73	1	20	763	1	3.52	3.73	0.95	0.51	9.0	9.6	1.42	.274	4.75	104	4.19	103	9.03	-2.1
23	Jim Turner J. Turner	4.28	1939	BSN	25	4	11	.267	22	50	9	0	0	157.2	181	75	83	10	51	4	2	692	2	2.85	2.91	0.98	0.57	7.2	7.4	1.47	.296	4.74	118	4.21	111	10.33	-8.7
24	Harry Gumbert H. Gumbert	4.32	1939	NYG	36	18	11	.621	34	81	14	2	0	243.2	257	117	132	21	81	1	1	1,047	5	2.99	2.99	1.00	0.78	7.7	7.7	1.39	.273	4.88	109	4.44	108	9.49	-8.4
25	Bob Klinger B. Klinger	4.36	1939	PIT	37	14	17	.452	33	64	10	2	0	225.0	251	109	120	11	81	3	3	989	6	2.56	3.24	0.79	0.44	6.5	8.2	1.48	.289	4.80	111	4.16	102	10.04	-2