to write a letter to an organization or a company, for example to ask about sth or to express an opinion :
I'll write in for more information.
to write a letter to an organization or a company, for example to ask about sth or to express an opinion :
I'll write in for more information.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005