Books ten and eleven of The History of Middle-earth return to the Silmarillion material, including the Annals of Beleriand, first featured in The Shaping of Middle-earth by Christopher Tolkien.

Book contents:

• 1. Prose fragments following the Lost Tales — brief, uncompleted texts which continue on from The Book of Lost Tales
• 2. The earliest "Silmarillion" — also referred to as the "Sketch of the Mythology", this is the start of the Silmarillion proper
• 3. The Quenta — a further developed version of the "Sketch", the first full narrative since the Tales
• 4. The first "Silmarillion" map — a reproduction of the first map of Beleriand
• 5. The Ambarkanta — cosmological essays, maps, and diagrams
• 6. The earliest Annals of Valinor
• 7. The earliest Annals of Beleriand