The letters of John Murray [III] to Austen Henry Layard have been placed at the beginning of the sequence, with letters to Benjamin Austen placed at the end of the sequence.

Letters of John Murray [III] to Austen Henry Layard, 1848: folios 1-14;

Letters of John Murray [III] to Austen Henry Layard, 1849: folios 15-32;

Letters of John Murray [III] to Austen Henry Layard, 1853: folios 33-34;

Letters and envelopes of John Murray [III] to Benjamin Austen, 1849-1852: folios 35-45.