The contents are as follows:
Correspondence, papers and drawings, 1811, 1814-1821, of John Rennie concerning Southwark Bridge (MS.19774);
Copies of letters, 1815-1819, written by John Rennie to Joshua Walker and Company of Rotherham, who supplied the iron for Southwark Bridge (MS.19775);
Correspondence, reports, and prints, 1810-1818, undated, of John Rennie concerning Waterloo Bridge (MS.19776);
Notebook, 1817, containing a detailed account, including many diagrams, of the construction of Waterloo Bridge, compiled by George Rennie (MS.19777).