The Kentucky birth index lists Marvin Brown, born 29 July 1912 in Breathitt Co. (a misindexing of Rowan Co.11), mother’s maiden name Daisy Ramey. It is a delayed certificate, filed in 1957. The year of birth may be off by a year; he was recorded as age 9 in the 1920 census, and if he was born in July 1912 he would only be 7 1/2. But it was the birth date that he went by as an adult, at any rate.

The SSDI lists Marvin Brown, born 29 July 1912, died May 1979, last residence Charleston, Kanawha Co., West Virginia.

1940 census of Kanawha Co., West Virginia, Cabin Creek district, ED 20-26 (included Kayford and Leewood), enumerated 6 April, lists on p. 8A as family #1125:
Brown, Marvin, 27, track layer at coal mines, b. Ky; Edith, wife, 21, b. WVa; Marceda, dau, 4, b. WVa; Benny, son, 2, b. WVa. Living in same place in 1935.