Blind Lemon is a good example of what is known as the "country blues."  There are some quotes about "country blues" as follows: 
Country blues is where it all began. Go back to the early days of 78s and you'll find the countryblues of Blind Lemon Jefferson and Robert Johnson. Nowadays, Taj Mahal and Keb'Mo' (among others) are playing with the fire, the raw energy of country blues. Country blues is intimate, poetic, soul-searching stuff.
--it is from the biography of Kelly Joe Phelps "Dust bowl memories, you can hear me shout :  ROLL AWAY THE STONE" on Fleming Tamulevich and Associates Online

EARLY COUNTRY bluesmen were itinerant minstrels playing battered acoustic guitars, shouting the blues so it could be heard over the din of crowds in saloons, at parties and noises in the marketplace. Without amplification, these mens' voices became strong and insistent, their guitars playing dramatic and punctuated by piercing riffs. Modern guitarists who first hear this music are usually shocked to learn that the simultaneous playing of complex rhythmic bass and melodies, accompanied by vocals, is usually the work of one person playing alone.
--This quote from "Deep Blues: Roots Music of the Deep South" on RETROradio

The earliest blues, country blues, were a product of the 19th-century black rural experience, especially after emancipation. Itinerant performers traveled from one black community to another, playing the guitar while singing about the loss of love, the pain of poverty, the burden of hard work. Like much folk expression, many songs spoke of the delights and torments of sex. Early country blues still may be heard on records made by Leadbelly, Blind Lemon Jefferson, and others. Jelly Roll Morton wrote his "New Orleans Blues" in 1902. Among the earliest blues published as sheet music were those of W. C. Handy. They included "Memphis Blues" (1912) and "The St. Louis Blues" (1914).
--Third quote about country blues is from "The Blues" on This Blues Ring site.

Texas blues tends to be more sophisticated and intricate than those of the deep south, with longer guitar phrases and greater melodic range than are ordinarily found in the blues of Mississippi River states, and usually employing a repetitive bass line. Louisianians are notable chiefly for their nonconformity with musicians from contiguous states and their use of  bottleneck and open tunings.
--This quote is from yazoo texas blues