preview: https://www.google.com/books/edition/Learning_Spanish_Words_...
It's just a bunch of vocabulary paired with etymology notes and observations/sounds-likes to make the vocabulary memorable.
EDIT, hm he seems to be missing some obvious cognates, e.g.
>propio, own (adj.); proper (cognate). Proper in modern English no longer has the meaning "own", but this word in Spanish, propio, still retains it. if this knowledge is too uninteresting, use a mnemonic such as "A truly proper lady behaves in her own natural style."
wtf? What about just the English word "property" instead of this silly lady business?
I'd often come up with little stories to teach myself some of the more complex Chinese characters when I was learning quite intensively and found I never struggled to remember those words after doing so.