If possible, use a proper scanner.
Settings: Black and White. Size: Letter (8.5 x 11). Output: PDF (without OCR).

If you do not have access to a scanner, you can use a free Adobe Scan app.

Android –

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.