Rod,
These were copies of handwritten scales with fingerings, all the major and minor scales, one, two and three octaves. There were rythmic variations and extensive bowing patterns (four pages) to use with the scales. The closest thing I've seen since then is the Rabbath Book Three; in fact, he might be even more comprehensive.
They weren't published as far as I know but couldn't be considered black market as they were just handouts for his bass students.
They would be good for any proffessional to use to polish their technique or expose some area that maybe had been neglected.
I am not familiar with the Starker approach so wouldn't have a valid comment.