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Sedning letters to entire book
First, I would do a spell check before sedning
FWIW, too many people don't read . . . anything. Email, letters . . . they will glance at a post card for a few seconds before tossing it.
When they do read it is generally the first paragraph or two then maybe scan bullet points. So don't knock yourself out. Stick to the basics.
Postcards are not personalized but you have a better chance of getting your message read by more people than stuffing envelopes