Question

boOk for letter writing
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Answer 1

Answer:

question is wrong please correct it

Answer 2

Answer:

Start with a secretarial training manual and a secretarial typewriting workbook, such as those published by Pitman’s Institute and similar other secretarial training providers.

I suggest the above as the starting point because I presume you’re not a trained secretary, who is more often the person who knows quite a fair bit about formal correspondence.

It’s no good going for the deep end with specialist writing tomes unless you have a fairly good grounding in what’s involved in correspondence work.