They are in the attic at the moment, but they are all fairly old books (and terse, dry, basic formatting/illustration), seemingly from a period in time when infitesimals were apparently more popular.
There are a few similar ones on IA, e.g.
https://archive.org/details/in.ernet.dli.2015.148501/page/n8...
On that page the 'h' term is the infitesimal, as in
d(x^2) / dx = 2x + h
Though I prefer something like 'Δx' to make the link to x more explicit. Would love to see a more modern book on the topic.
