| Reference number | Title | Date |
| EC/1946/14 | Penney, William George, Baron Penney of East Hendred: certificate of election to the Royal Society | |
| PB/1/18/5 | Short notes and correspondence re Blackett's service at Imperial College | 1970-1974 |
| IM/003499 | Penney, William George, Baron Penney of East Hendred | circa 1945/6 |
| PB/1/23 | Correspondence re cataloguing and permanent deposit of Blackett's personal papers | 1972 |
| PB/1/18/4 | Short notes and correspondence re Blackett's service at Imperial College | 1965-1968 |
| IM/003502 | Penney, William George, Baron Penney of East Hendred | nd |
| IM/003500 | Penney, William George, Baron Penney of East Hendred | nd |
| WF/492 | Grant application from Imperial College London to the Wolfson Foundation | 1972-1977 |
| RR/54/82 | Referee's report by Ralph Howard Fowler, on a paper 'The theory of the stability of the benzene ring and related compounds' by William George Penney | April 1934 |
| RR/62/37 | Referee's report by Douglas Rayner Hartree, on a paper 'On the assignment of the fundamental vibration frequencies in O3, F2O, Cl2O, NO, and N3-' by Gordon Brims Black McIvor Sutherland and William George Penney | [May 1936] |
| RR/72/76 | Referee's report by William George Penney, on a paper 'The effect of diffusion of the main reactants on flame speeds in gases' by J Corner | 1949 |
| RR/68/101 | Referee's report by Edward George Bowen, on a paper 'On the heat of sublimation of carbon and on some absorption bands of three mesomeric hydrocarbons' by G J Kynch and William George Penney | [1941] |
| RR/72/75 | Letter from William George Penney, on a paper 'The effect of diffusion of the main reactants on flame speeds in gases' by J Corner to D C Martin, Assistant Secretary of the Royal Society | 6 April 1949 |
| RR/68/271 | Referee's report by William George Penney, Baron Penney of East Hendred, on a paper 'The occurrence and properties of molecular vibrations with V(x) = ax4' by Ronald Percy Bell | [1943] |
| RR/72/202 | Referee's report by William George Penney, on a paper 'The electron pairing theory of the structure of conjugated hydrocarbons' by W Moffitt | 18 July 1949 |
| RR/71/168 | Referee's report by William George Penney, Baron Penney of East Hendred, on a paper 'Splashes from underwater explosions' by H Kolsky, J P Lewis, M T Sampson, A C Shearman and C I Snow | [1948] |
| RR/68/468 | Referee's report by Owen Willans Richardson, on a paper 'The dissociation energies of CO, N2, NO and CN' by Alfred Gordon Gaydon and William George Penney | [1944] |
| RR/71/157 | Referee's report by William George Penney, Baron Penney of East Hendred, on a paper 'On the bond lengths and interatomic distances in certain molecules and crystals' by William Hume-Rothery | [1948] |
| RR/71/47 | Referee's report by William George Penney, Baron Penney of East Hendred, on a paper 'The structure of the reaction zone in a flame' by Samuel Francis Boys and J Corner | 17 October 1948 |
| RR/71/179 | Referee's report by William George Penney, Baron Penney of East Hendred, on a paper 'The diffraction of blast. I' by Michael James Lighthill | [1948] |
| RR/72/233 | Referee's report by William George Penney, on a paper 'The dispersion of a pressure pulse in the atmosphere' by R S Scorer | 16 October 1949 |
| RR/72/260 | Referee's report by William George Penney, on a paper 'The supersonic flow of compressible fluid through axially symmetric tubes of uniform and varying section' by R K Tempest | 29 August 1949 |
| RR/72/259 | Letter from William George Penney, on a paper 'The supersonic flow of compressible fluid through axially symmetric tubes of uniform and varying section' by R K Tempest to D C Martin, Assistant Secretary of the Royal Society | 6 October 1949 |
| IM/003503 | Penney, William George, Baron Penney of East Hendred | nd |
| IM/003501 | Penney, William George, Baron Penney of East Hendred | nd |
| IM/GA/CCM/8815 | Penney, William George, Baron Penney of East Hendred | nd |
| RR/60/41 | Referee's report by Douglas Rayner Hartree, on a paper 'On the relation between the form, force constants, and vibration frequencies of triatomic systems' by William George Penney and Gordon Brims Black Mcivor Sutherland | May 1936 |
| RR/72/42 | Referee's report by William George Penney, on two papers 'Electronic wave functions - I. A general method of calculation for the stationary states of any molecular system' and 'Electronic wave functions II. A calculation for the ground state of the beryllium atom' by Samuel Francis Boys | 30 October 1949 |
| RR/50/83 | Referee's report by Charles Galton Darwin, on a paper 'The theory of the structure of ethylene and a note on the structure of ethane' by William George Penney | November 1933 |