I suspect a rather wide-ranging net was cast when gathering many recipes for some older books. Iffy contributions from inexpert (and suspicious) sources, i.e., companies interested in flogging their products for more varied uses (and greater profit).
Some years back, a co-worker in our department was pushing a rather slim cookbook (a pamphlet really, with color photographs) put together by students at his son’s high school. Done to raise money. So, a few of us are listening to the dad’s spiel. The photos had the rather flat, slightly-faded dead appearance of photos I’d seen in antique store cookbooks. No one there spoke their mind (out of courtesy) except one fellow who said, “These don’t look too good” and “The bowls look like dog food bowls”… and they did. Dad got mad; “Okay, if you don’t want to buy these!” then left the cubicle.