NEW YORK (AP) - Selected transcripts and audio of Richard Nixon's Oval Office conversations will be published in book form next August, the 40th anniversary of Nixon's resignation from the presidency. Houghton Mifflin Harcourt announced Tuesday that "The Nixon Tapes" will feature the first transcriptions of Nixon and his aides discussing subjects ranging from Vietnam to Nixon's 1972 re-election campaign. The country first learned that the tapes existed during Senate hearings in 1973 that looked into the growing Watergate scandal, which eventually led to Nixon's departure. The last of some 4,000 hours of conversations was finally made public this year. "The Nixon Tapes" will be edited and annotated by historian Douglas Brinkley, who helped compile a book of Ronald Reagan's diaries, and Luke Nichter, whose website www.nixontapes.org features digital recordings of Nixon's conversations.