I found a few of my saved packets. I used to make these particular recipes a lot. I made the Pumpernickel so often that I wrote it out and had tossed the packet because it had fallen apart. 1977-78. 
Two functional bakes to fit into the routine and needs of the family.
Today's bake: Big and Bubbly Focaccia
Source: https://www.kingarthurbaking.com/recipes/big-and-bubbly-focaccia-recipe
Notes:
From TDW:705gr Pan Size: 9x9x2 In / 22.86x22.86x5.08 CM
It was more or less a "freestyle" recipe, a spontaneous decision to bake with flaxseeds.
80% white flour
5% spelt flour
15% whole wheat flour
25% whole rye sourdough
100% hydration
15% flaxseeds (soaked in the water the night before)
The flaxseeds are pretty "thirsty", the dough felt more like 70%-75% hydration
Well I’m impressed that it’s not a disaster and I learned a LOT along the way.
Never change too many things with a bake at once. CHECK! ( ignored)
Never try to multitask to the point of complete forgetfulness. CHECK! ( ignored)
Be grateful that even though everything went awry the bread is wonderful . CHECK!!!!
This is my very first true sourdough enriched bread ever HAHAHAHA (can't you tell how ecstatic I am? Oh, and not counting my potato loaves). It was a lot of trials and errors with my starter and fermentation schedule. Oh boy, glad I'm finally here.
Cariah Marey has settled on satisfactory ratio. She is 1:1:1:1 bran:skim-milk-powder:water:butter at the moment. Skim milk lends lactose to increase osmotic pressure, while butter is there as ankle weight. She had little tolerance toward butter. Putting butter in the starter allows her to adapt over time, and she already has.
Recently there was a TFL thread that linked back to txfarmer's post from long ago in pain-de-mie, or slightly enriched soft shreadable sandwich loaves. Here's the link:
https://www.thefreshloaf.com/node/20669/sourdough-pan-de-mie-how-make-quotshreddablyquot-soft-bread
