If possible, use a proper scanner. Settings: Black and White. Output: PDF (without OCR).
If you do not have access to a scanner, you can use a free Adobe Scan app.
Change app setting to turn off “Run text recognition on saved PDF”.
Turn on “Save original images to gallery”
Make sure the pages you are scanning are perfectly flat – not folded or creased.
After the scan, choose the ‘resize’ to US Letter option, then save the PDF and email it to Adam.