The Complete Guide to Middle-earth: from The Hobbit to The Silmarillion is a reference book for the fictional universe of J. R. R. Tolkien's Middle-earth, compiled and edited by Robert Foster. The Complete Guide to Middle-earth is a major expansion of Foster's A Guide to Middle-earth, which was published in a limited edition by Mirage Press in 1971. Almost twice the length of the original (573 pages vs. 292 pages), the 1978 version incorporates extensive entries related to The Silmarillion (1977). A further revised edition (ISBN 0-345-44976-2) was published in 2001 in time for the The Lord of the Rings film trilogy.