TOM TURPIN
There's a good bio of him here.
Bill Edwards' page is a great source for all things ragtime, and his bio of Turpin is here.
Here's another good one from All Music.
Here is a story about ragtime in St. Louis magazine which includes information on Turpin, Stark, and Joplin.
SCOTT JOPLIN
This is a cool article on Sedalia, MO, including some info about Joplin's time there.
Also check out some new books, Dancing to a Black Man's Tune by Susan Curtis, and King of Ragtime and Ed Berlin.
Here's a pretty good short bio of Joplin.
Here's a piece about the Joplin and the Joplin Festival in Sedalia.
JAMES SCOTT
This is a good bio in the Joplin Globe. There seems to be some discrepancy in the bios as to when he moved to Kansas City, etc. But a lot of information of this era is hard to document.
All Music has a bio here.
Here's a quick on from the Library of Congress.
Here's a rarely seen photo of Mr. Scott.
And of course, Bill Edwards is also a great source of information.
ETHYL SMITH
Courtesy of Bill Edwards.
IRENE GIBLIN
Here's a short take.
And here's Bill Edwards' bio of her.
Courtesy of Black Music Scholar.
LUCIAN PORTER GIBSON
From Bill Edwards page.
And here is another short piece about him.