highest isolated power in a season by a catcher minimum 400 plate appearances before 1961

Before 1961, Rudy York had the highest isolated power by a catcher with 400+ plate appearances in a season, with an isolated power of .344 in his rookie season in 1937.

	NAME	ISO	PA	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Rudy York R. York	.344	417	1937	DET	104	375	72	115	18	3	35	101	41	0	52	3	2	244	56	1				.307	.375	.651	1.026	87	35.1	.447	144	26.7
2	Roy Campanella R. Campanella	.299	590	1953	BKN	144	519	103	162	26	3	41	142	67	4	58	4	2	317	70	0			13	.312	.395	.611	1.006	120	49.8	.441	154	41.8
3	Gabby Hartnett G. Hartnett	.291	578	1930	CHC	141	508	84	172	31	3	37	122	55	1	62	0		320	71	14				.339	.404	.630	1.034	127	45.2	.444	141	37.1
4	Walker Cooper W. Cooper	.282	546	1947	NYG	140	515	79	157	24	8	35	122	24	3	43	2		302	67	4			13	.305	.339	.586	.926	95	33.5	.416	137	25.5
5	Rudy York R. York	.281	557	1938	DET	135	463	86	138	27	2	33	126	92	2	74	1	2	268	62	0				.298	.417	.579	.995	116	45.8	.445	138	30.8
6	Roy Campanella R. Campanella	.270	494	1950	BKN	126	437	70	123	19	3	31	89	55	2	51	1		241	53	0			17	.281	.364	.551	.916	86	24.4	.406	134	21.6
7	Stan Lopata S. Lopata	.267	624	1956	PHI	146	535	96	143	33	7	32	95	75	1	93	5	2	286	72	4	9	10	17	.267	.353	.535	.888	99	27.2	.381	134	25.4
8	Gabby Hartnett G. Hartnett	.266	443	1925	CHC	117	398	61	115	28	3	24	67	36	2	77	1	5	221	55	7				.289	.351	.555	.906	75	17.2	.400	122	13.7
9	Roy Campanella R. Campanella	.265	562	1951	BKN	143	505	90	164	33	1	33	108	53	4	51	1	2	298	67	0			19	.325	.393	.590	.983	111	45.5	.440	158	40.7
10	Roy Campanella R. Campanella	.265	522	1955	BKN	123	446	81	142	20	1	32	107	56	6	41	2	3	260	53	5	9	9	14	.318	.395	.583	.978	100	38.9	.421	149	32.1
11	Andy Seminick A. Seminick	.260	411	1949	PHN	109	334	52	81	11	2	24	68	69	5	74	0		168	37	3			10	.243	.380	.503	.883	69	20.1	.406	138	19.3
12	Bill Dickey B. Dickey	.256	532	1938	NYY	132	454	84	142	27	4	27	115	75	2	22	3	0	258	58	1				.313	.412	.568	.981	108	41.5	.440	142	32.5
13	Bill Dickey B. Dickey	.255	472	1936	NYY	112	423	99	153	26	8	22	107	46	3	16	0	2	261	56	0				.362	.428	.617	1.045	107	45.1	.464	152	37.4
14	Ed Bailey E. Bailey	.251	446	1956	CIN	118	383	59	115	8	2	28	75	52	3	50	2	0	211	38	4	4	11	7	.300	.385	.551	.936	79	27.1	.402	142	22.7
15	Bill Dickey B. Dickey	.238	608	1937	NYY	140	530	87	176	35	2	29	133	73	4	22	3	2	302	66	1				.332	.417	.570	.987	125	48.8	.442	147	41.1
16	Andy Seminick A. Seminick	.237	467	1950	PHN	130	393	55	113	15	3	24	68	68	6	50	0		206	42	0			12	.288	.400	.524	.925	85	27.1	.417	144	26.8
17	Yogi Berra Y. Berra	.236	597	1956	NYY	140	521	93	155	29	2	30	105	65	5	29	3	2	278	61	1	5	7	8	.298	.378	.534	.911	103	33.6	.396	139	29.6
18	Frankie Hayes F. Hayes	.227	486	1939	PHA	124	431	66	122	28	5	20	83	40	3	55	4	1	220	53	12			10	.283	.348	.510	.859	77	16.3	.385	113	8.8
19	Yogi Berra Y. Berra	.227	557	1953	NYY	137	503	80	149	23	5	27	108	50	3	32	0	3	263	55	1			7	.296	.363	.523	.886	93	26.1	.394	140	27.7
20	Gabby Hartnett G. Hartnett	.223	407	1924	CHC	111	354	56	106	17	7	16	67	39	5	37	10	2	185	40	9				.299	.377	.523	.899	70	19.9	.409	138	19.4
21	Gabby Hartnett G. Hartnett	.222	464	1928	CHC	120	388	61	117	26	9	14	57	65	2	32	3		203	49	9				.302	.404	.523	.928	85	28.4	.421	139	24
22	Del Crandall D. Crandall	.220	494	1955	MIL	133	440	61	104	15	2	26	62	40	2	56	2	1	201	43	6	6	11	12	.236	.299	.457	.756	57	-0.6	.325	100	-0.2
23	Mickey Cochrane M. Cochrane	.216	625	1932	PHA	139	518	118	152	35	4	23	112	100	4	22	0	1	264	62	3				.293	.412	.510	.921	118	40	.415	136	31.3
24	Gus Triandos G. Triandos	.214	468	1959	BAL	126	393	43	85	7	1	25	73	65	3	56	0	0	169	33	4	3	6	12	.216	.330	.430	.760	60	6.3	.336	112	6.5
25	Yogi Berra Y. Berra	.211	656	1950	NYY	151	597	116	192	30	6	28	124	55	4	12	4	2	318	64	0			11	.322	.383	.533	.915	116	34.5	.410	132	29.1