whatme, while you are looking for some literature on the physiology of lactation, keep an eye open for a bit of education on bf/ff choices among working women.
Working is not a factor in bf/ff. UK infant feeding surveys have shown this from the start (the first one was 1980, IIRC). The sooner a mother goes back to work, and the more likely she is to return to work, the more likely she is to breastfeed.
Working class women are less likely to bf than middle class women, but the evidence is that actually working has very little to do with it.
And while I am still here :), your idea that formula was invented invented "c 100 years ago to precisely solve the problem of babies/mothers who were unable to BF and reduce infant death" is incorrect.
Your dates are wrong, for a start.
The first proprietary infant foods designed to supplement or replace breastmilk came out in the West about 150 years ago and just like many other new products, they were a commercial invention designed to make money.
Automated processing made large-scale production more feasible than before and far from saving babies' lives, it was known from the start that these foods and the lethal bottles and teats they were served in, contributed seriously to infant death and illness and under-nutrition. You can read commentary about this from official sources all over the developed world from the late 19th century to round about WW2 - a lot of it patronising and hand-wringing about feckless women and so on but springing from the widespread observation that doing anything but bf was harmful.
The invention of National Dried Milk in the 1940s was an attempt to standardise breastmilk substitutes and to protect infant health that way.