I already had those texts in my private library.
I noticed that the pdf files of the Schrevel books are actually worse than what the display shows, at least on my screen. For example, download the pdf of the 1832 edition and compare p. 28 of the pdf with p. 21 of the on-line viewer. You may guess the word in the top left corner in the on-line viewer, but that's no way in the pdf, which is the one you print.
As for the Hederich, I agree it is a great, clean copy. What Google has seems to be a complete Latin-Greek lexicon from A to Z. I found at the library the Greek-Latin but it's the usual bad scan.