I played a master class for him in college. He's a sweet dude but damn did he tear me a new one. Bach 3 Gigue or Koussevitzky Mvt. 1 if I recall. His methodology is amazing. My teacher was responsible for funding his first trip to the US. Humbling experience to say the least!I've been and am using Gajdoš edition of Sevcik's bowings, which is more complete book from @Michael Drost post #24 above. I believe I'm not violating any rules or copyrights by attaching it here.
Mr. Gajdoš is a virtuoso and one of the top teachers in Czech. The story says that as a youngster he studied violin, later switched to bass, and lacking a sensible bowing variation method, he edited Sevcik's bowings for the bas, for the use of his and his students. In the book there are bowing variations with prescribed tempo etc., and few progressive Sevcik etudes transposed to bass clef.
The book gives the most when studied with no rush. I don't really think it's meant to be learned and forgotten; rather, it's good to revisit it from time to time to clean up your technique and to put newly learned ideas into context. When I play it nowadays, I always repeat some excersise from etude 1 and then play some other from more advanced etudes. The format is such that you learn the etude quickly, and can play without looking into sheet, so you can focus on performing the strokes, or you can close your eyes and focus on tensions in your body. I recommend the metronome, in prescribed tempos, or lower.
The scan is meant to be printed on A3 both sides, and then tied in the middle.
Video of him in Chicago