Question: When was the book "The Lord of the Rings" published?
About the article "The Lord of the Rings", section "Themes".

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"The Lord of the Rings" has been adapted for film, radio and stage.
The book has been adapted for radio four times.
In 1955 and 1956, the BBC broadcast "The Lord of the Rings", a 12-part radio adaptation of the story.
In the 1960s radio station WBAI produced a short radio adaptation.
A 1979 dramatization of "The Lord of the Rings" was broadcast in the United States and subsequently issued on tape and CD.
In 1981, the BBC broadcast "The Lord of the Rings", a new dramatization in 26 half-hour instalments.
This dramatization of "The Lord of the Rings" has subsequently been made available on both tape and CD both by the BBC and other publishers.
For this purpose it is generally edited into 13 one hour episodes.
Two film adaptations of the book have been made.
The first was "J. R. R. Tolkien's The Lord of the Rings" (1978), by animator Ralph Bakshi, the first part of what was originally intended to be a two-part adaptation of the story; it covers "The Fellowship of the Ring" and part of "The Two Towers".
A three-issue comic book version of the movie was also published in Europe (but not printed in English), with illustrations by Luis Bermejo.
When Bakshi's investors shied away of financing the second film that would complete the story, the remainder of the story was covered in an animated television special by Rankin-Bass.
Stylistically, the two segments are very different.
The second and more critically and commercially successful adaptation was Peter Jackson's live action "The Lord of the Rings" film trilogy, produced by New Line Cinema and released in three instalments as ' (2001), ' (2002), and "" (2003).
All three parts won multiple Academy Awards, including consecutive Best Picture nominations.
The final instalment of this trilogy was the second film to break the one-billion-dollar barrier and won a total of 11 Oscars (something only two other films in history, "Ben-Hur" and "Titanic", have accomplished), including Best Picture, Best Director and Best Adapted Screenplay.
"The Hunt for Gollum", a fan film based on elements of the appendices to "The Lord of the Rings", was released on the internet in May 2009 and has been covered in major media.
In 1990, Recorded Books published an audio version of "The Lord of the Rings", with British actor Rob Inglis – who had previously starred in his own one-man stage productions of "The Hobbit" and "The Lord of the Rings" – reading.
A large-scale musical theatre adaptation, "The Lord of the Rings" was first staged in Toronto, Ontario, Canada in 2006 and opened in London in May 2007. 
Boyens first became a Tolkien fan as a child.
When she came on board to help the writing team on "The Lord of the Rings", she had already read the book seven times. 
Tolkien's "The Hobbit", a children's book, was first published in 1937, and it proved popular.
However, "The Lord of the Rings", first published in 1954 through 1955, would give rise to the fandom as a cultural phenomenon from the early to mid-1960s. 
  "The Book of Lost Tales 1" (1983)  "The Book of Lost Tales 2" (1984)  "The Lays of Beleriand" (1985)  "The Shaping of Middle-earth" (1986)  "The Lost Road and Other Writings" (1987)  "The Return of the Shadow" (The History of The Lord of the Rings v.1) (1988)  "The Treason of Isengard" (The History of The Lord of the Rings v.2) (1989)  "The War of the Ring" (The History of The Lord of the Rings v.3) (1990)  "Sauron Defeated" (includes The History of The Lord of the Rings v.4) (1992)  "Morgoth's Ring" (The Later Silmarillion v.1) (1993)  "The War of the Jewels" (The Later Silmarillion v.2) (1994)  "The Peoples of Middle-earth" (1996) Volumes.
A combined index was published six years after the series was completed as "" (2002).
A shorter version of volume 9 omitting material not related to The Lord of the Rings was published as "The End of the Third Age". 
The system’s first entry was a boxed set (ICE #LR0) containing the scenario "Dawn Comes Early" which also included guidelines, maps, character bios, and cardboard characters with stands.
The next was the scenario book "Darker Than the Darkness" (ICE #LR1) and then the scenario book "Over the Misty Mountains Cold" (ICE #LR2).
Two more scenario books in the series were planned but never published.
Two subsequent Middle-earth based role-playing games, "The Lord of the Rings Roleplaying Game" (2002) and "" (2011), were published respectively by Decipher Inc. and Cubicle 7.
Except for the original source material, the Decipher and Cubicle 7 games share no link to ICE's "Lord of the Rings Adventure Game" and use entirely different rules systems.