who has the most hr in a month before 1956 with career home runs under 100

Before 1956, Rudy York smashed the most home runs with <100 home runs in a month, with 18 homers in August 1937.

	NAME	HR	MONTH	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Rudy York R. York	18	August 1937	30	113	27	41	5	2	50	13	0	14	1		126	104	25	0				.363	.429	.920	1.349
2	Rudy York R. York	17	August 1943	31	112	29	40	4	0	43	21	0	19	0		134	95	21	1			2	.357	.459	.848	1.307
3	Babe Ruth B. Ruth	17	September 1927	27	103	29	39	3	1	43	19	0	15	3		126	95	21	4				.379	.475	.922	1.398
4	Ralph Kiner R. Kiner	16	September 1949	27	92	28	30	4	1	32	28	0	10	2		120	84	21	0			4	.326	.483	.913	1.396
5	Hank Greenberg H. Greenberg	16	September 1946	27	94	26	30	4	0	39	21	0	18	0		115	82	20	0			3	.319	.443	.872	1.316
6	Duke Snider D. Snider	15	August 1953	31	127	30	44	7	0	41	12	1	22	0	2	141	96	22	1			1	.346	.407	.756	1.163
7	Hank Greenberg H. Greenberg	15	September 1940	27	96	34	38	7	2	38	26	0	13	2		122	94	24	0			0	.396	.525	.979	1.504
8	Harlond Clift H. Clift	15	August 1938	32	114	32	38	8	1	34	25	0	15	4		140	93	24	1				.333	.453	.816	1.269
9	Hank Greenberg H. Greenberg	15	July 1938	26	94	27	34	4	0	32	16	0	12	2		111	83	19	1				.362	.455	.883	1.338
10	Joe DiMaggio J. DiMaggio	15	July 1937	29	121	40	52	10	6	43	17	1	9	2		139	119	31	0				.430	.504	.983	1.487
11	Bob Johnson B. Johnson	15	June 1934	28	117	30	39	6	1	28	8	0	11	0		125	92	22	0				.333	.376	.786	1.162
12	Babe Ruth B. Ruth	15	June 1930	28	97	43	38	6	0	35	37	0	12	2		137	89	21	3				.392	.560	.918	1.477
13	Babe Ruth B. Ruth	15	August 1929	31	118	31	41	7	2	47	12	0	16	0		133	97	24	3				.347	.408	.822	1.230
14	Babe Ruth B. Ruth	15	May 1928	29	99	32	41	5	4	37	28	1	20	0		129	99	24	1				.414	.547	1.000	1.547
15	Cy Williams C. Williams	15	May 1923	30	124	29	44	8	0	44	17	1	9	5		142	97	23	0				.355	.437	.782	1.219
16	Ralph Kiner R. Kiner	14	August 1947	33	121	27	36	2	0	31	27	0	16	1		148	80	16	0			3	.298	.426	.661	1.087
17	Ralph Kiner R. Kiner	14	June 1947	29	122	27	42	6	1	32	10	1	17	0		133	92	21	0			5	.344	.398	.754	1.153
18	Joe DiMaggio J. DiMaggio	14	August 1939	31	131	37	53	7	0	53	19	1	4	0		154	102	21	3			2	.405	.483	.779	1.262
19	Chuck Klein C. Klein	14	July 1929	28	116	24	52	7	1	40	13	0	11	1		129	103	22	0				.448	.504	.888	1.392
20	Babe Ruth B. Ruth	14	July 1924	37	131	43	59	9	3	40	31	0	16	2		164	116	26	2				.450	.556	.885	1.441
21	Ernie Banks E. Banks	13	July 1955	32	124	22	34	4	0	30	10	1	16	1	2	136	77	17	0	1	2	7	.274	.331	.621	.952
22	Willie Mays W. Mays	13	July 1955	32	124	28	39	5	0	26	17	0	8	6	0	143	83	18	0	2	4	4	.315	.392	.669	1.061
23	Ted Kluszewski T. Kluszewski	13	August 1954	28	116	26	44	8	1	28	6	2	6	0	1	125	93	22	0	1		2	.379	.416	.802	1.218
24	Eddie Mathews E. Mathews	13	July 1954	32	114	26	33	1	1	28	31	0	13	2	2	146	75	15	1	0		1	.289	.441	.658	1.099
25	Clyde Vollmer C. Vollmer	13	July 1951	28	105	25	31	4	1	40	15	0	14	0	0	120	76	18	0			6	.295	.383	.724	1.107