I dont think the grape cure is by Arnold Ehret.
It is by Johanna Brandt it was written like in the 30s or something
Here are some of the online books by Ehret who was a raw foodist in the 30s or so and originated the mucusless diet promoted by Dr Christopher teacher of Dr Schulze. He and his disciples achieved phenomenal health almost unseen before
I read a treatise by one of his disciples who went raw (vegan) and was already healthy being a vegetarian many years
some of what she then got by eating mainly above the grounds fruits and veggies were as follows:
-skin softer than a baby
-eyesight better than 20-20
-complete change of disposition that every commented on -her peace and loving demeanor
-could go up very steep hill without even breathing hard
-all aches and little ills he had went away she mentioned more but that is all I remember having read this about 325 years ago and being so impressed i never forgot it.
the grape cure is sold at Ehrets site though
here are some free health books online
dr schulze books
53 books may have to paste and copy into the search engine as don't seem to be able to click them.