Bruce Barnbaum Stock Solution?

I've been reading Bruce Barnbaum's "The Art of Photography (2e)" and am eager to try his HC110 development recipe for HP5+400 (35mm).

HOWEVER, I have been unable to determine the stock solution that he uses for HC110 development. It seems all of the development instructions/recipes call for a specific dilution of the stock to create a working solution, but I cannot find anything in the text that actually states what the stock solution is...

I was wondering if anyone knows what Barnbaum was using for a stock solution in the examples he gives in the book?

Is he just diluting from a 1:31 Dilution B stock?

From the HC-110 datasheet, found here: https://125px.com/docs/techpubs/kodak/j24-2017.pdf

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Commercial labs or other high volume users would normally mix up the stock solution, and then work from that on a day-to-day basis.

MattKing said:

From the HC-110 datasheet, found here: https://125px.com/docs/techpubs/kodak/j24-2017.pdf
View attachment 411169
(red emphasis added)
Commercial labs or other high volume users would normally mix up the stock solution, and then work from that on a day-to-day basis.

Click to expand...

Bless you. I appreciate it!