| RefNo | Title | Source |
| DF/ZOO/257/2/22 | Rees, William James: Menai Bridge Science Laboratory, Wales: field notes | |
| DF/ZOO/257/2/21 | Rees, William James: John Murray Expedition : notes on actinians | |
| DF/ZOO/257/2/16 | Rees, William James: Rijksmuseum, Stockholm, Sweden: exchange of specimens | |
| DF/ZOO/208/89 | Staff file: Rees, William J | |
| DF/ZOO/257/2/20 | Rees, William James: Hydroids from West Africa: determinations of various collections | |
| DF/ZOO/257/2/35 | Rees, William James: 'Occasional notes on Cnidaria' | |
| DF/ZOO/257/2/1 | Rees, William James: 'On Cladonema myersi .... : typescript and artwork for a paper (1950) | |
| DF/ZOO/257/2/12 | Rees, William James: Gough Island Scientific Survey (Atlantic Ocean) | |
| DF/ADM/1005/60 | Rees, Dr William J | |
| DF/ZOO/208/126 | Staff file: Rees, William J | |
| DF/ZOO/213/113/38 | Rees, W F and Adam, W: report on Sepiidae (Volume XI/1) | |
| DF/ZOO/257/2/27 | Rees, William James: Medusae and other coelenterates from Miami, USA | |
| DF/ZOO/257/2/37 | Rees, William James: Systematic notes on the Hydrozoa | |
| DF/ZOO/257/2/5 | Rees, William James: Physalia physalis, the Portuguese man of war : newscuttings | |
| DF/ZOO/257/2/38 | Rees, William James: 'Plymouth Collections' : notes on 39 jars of Hydrozoa | |
| DF/ZOO/257/2/34 | Rees, William James: Atlantic Hydromedusae : temperature-salinity correlations | |
| DF/ZOO/257/2 | Rees, William James: Papers | |
| DF/ZOO/257/2/19 | Rees, William James: Zanzibar plankton analyses (Dr J H Wickstead) | |
| DF/ZOO/257/2/3 | Rees, William James: Rijksmuseum, Stockholm, Sweden: notes on collections | |
| DF/ZOO/257/2/18 | Rees, William James: Fauna and flora of the Gulf of Naples, Italy | |
| DF/ZOO/257/2/36 | W J Rees papers: Bibliographical notes on the orders Thecata and Athecata | |
| DF/ZOO/257/2/13 | Rees, William James: 'Evolutionary trends in the classification of capitate hydroids and medusae' | |
| DF/ZOO/257/2/33 | Rees, William James: 'A new hydroid, Podocoryne ...., from Sydney harbour', Australia | |
| DF/ZOO/257/2/30 | Rees, William James: Terra Nova Expedition (1910-1913) : lists of Medusae | |
| DF/ZOO/217/11 | Rees, W J: line drawings for 'Hydroids of the family Cytaeidae' Bulletin of the British Museum (Natural History) Zoology Series Vol 8(8), 1962 | |
| DF/ZOO/257/2/29 | Rees, William James: Copenhagen Museum, Denmark: list of hydroids in their collection | |
| DF/ZOO/257/2/39 | Rees, William James: Photographs of coelenterates | |
| DF/ZOO/257/2/17 | Rees, William James: Imperial College, London, Azores expedition, 1959 | |
| DF/ZOO/257/2/24 | Rees, William James: Zoological Society Symposium on Cnidaria : editing discussions for publication | |
| DF/ZOO/257/2/40 | Rees, William James: Great Barrier Reef Expedition : artwork published in Report on Actiniaria and Corallimorpha by O Carlgren | |
| DF/ZOO/257/2/6 | Rees, William James: Physalia physalis, the Portuguese man of war : sightings correspondence | |
| DF/ZOO/253/3 | Rees, William James: Correspondence and papers | |
| DF/ZOO/257/2/10 | Rees, William James: 'On three northern species of Hydractinia' : photographs by M G Sawyers to illustrate a paper (1956) | |
| DF/ZOO/257/2/8 | Rees, William James: Meteorological Office : correspondence on observations in ships' logbooks | |
| DF/ZOO/217/8 | Rees, W J: drawings and photographs for 'On a giant squid Omastrephes caroli Furtado stranded at Looe', Bulletin of the British Museum (Natural History), Zoology Series 1(2) | |
| DF/ZOO/217/12 | Rees, W J: line drawing for 'Observations on British and Norwegian hydroids and their medusae' Journal of the Marine Biological Association of the United Kingdom, vol 23(1), 1938 | |
| DF/ZOO/213/113/26 | Rees, W J: report on Cephalopoda (Volume XI/1) | |
| DF/ZOO/257/2/25 | Rees, William James: Zoological Society Symposium on Cnidaria : artwork for Rees' paper on evolution of Hydrozoa | |
| DF/ZOO/257/2/23 | Rees, William James: Zoological Society Symposium on Cnidaria : correspondence with contributors | |
| DF/ZOO/257/2/9 | Rees, William James: A tentative classification of Hydromedusae in the Museum collections | |
| DF/ZOO/208/39 | Official diary: Rees, W J | |
| DF/ZOO/257/2/31 | Rees, William James: Rosaura cruise : coelenterate determinations | |
| DF/ZOO/257/2/32 | Rees, William James: Notes on venomous coelenterates | |
| DF/ZOO/217/9 | Rees, W J and Adam, W: photographic artwork for 46 plates from 'A review of the family Sepiidae' John Murray Expedition Scientific Reports 11: 1-170 | |
| DF/ZOO/253/3/86 | Rees, William James: Correspondence, Swedmark, Dr B (Sweden) | |
| DF/ZOO/257/2/7 | Rees, William James: Physalia physalis, the Portuguese man of war (and velella): sightings correspondence | |
| DF/ZOO/257/2/41 | Rees, William James: F M R Dodman: line drawings of hydroids from the Singapore Fisheries Research collection, apparently unpublished | |
| DF/ZOO/257/2/2 | Rees, William James: Sir Lancelot cruises (1949-1950) : Medusae determinations | |
| DF/ZOO/257/2/4 | Rees, William James: E R Sykes: notes and correspondence for his obituary | |
| DF/ZOO/257/2/28 | Rees, William James: Falkland Island Dependencies Survey, Operation Tabarin : notes on coelenterates | |
| DF/ZOO/257/2/26 | Rees, William James: F M R Dodman: drawings of hydroids prepared for Rees | |
| DF/ZOO/257/2/14 | Rees, William James: Suggested plan for a monograph of the hydroids and medusae of the Mediterranean | |
| DF/ZOO/257/2/15 | Rees, William James: 'The relationships of Moerisia .... with capitate hydroids' | |
| DF/ZOO/257/2/11 | Rees, William James: Sir Douglas Mawson and the B A N Z A R E collections | |
| DF/ZOO/253/3/40 | Rees, William James: Correspondence, Hubendick, Dr B (Sweden) | |
| DF/ZOO/253/3/32 | Rees, William James: Correspondence, Fraser, Dr J H (Scotland) | |
| DF/ZOO/253/3/23 | Rees, William James: Correspondence, Dahl, Prof E (Sweden) | |
| DF/ZOO/254 | Mollusca Section Correspondence and papers | |
| DF/ZOO/217/13 | Rees, W J: watercolour drawings for 'Hydroids and Hydromedusae of the British Isles' by G L Wilkins | |
| DF/PH/2/6/11 | Staff Group Photograph: Zoology Department | |
| DF/ZOO/257 | Coelenterata Section Research papers | |