| 12398 | 13088 | edited by Vincent T Manas | The national plumbing code handbook : standards and design information, based on National Plumbing Code ASA A40.8 | 1957 | WCP | Manas, |
| 12399 | 13087 | James M Haig | The householder's guide to plumbing | 1974 | WCP | Haig, |
| 12400 | 13071 | compiled by John Croydon | The glossary of building trade abbreviations | 1946 | WCP | Croydo |
| 12401 | 2256 | RPA | List of registered plumbers : 1. Southern Area issued by Registered Plumbers Association | 1962 | WCP | RPA |
| 12402 | 13093 | RPA | List of registered plumbers : Areas 2 and 3, issued by Registered Plumbers Association | 1963 | WCP | RPA |
| 12403 | 13090 | edited by I D Jacobson | Plumbing dictionary | 1971 | WCP | Jacobs |
| 12404 | 8934 | Alan Kelly | Financial planning for the individual : a guide to investment and personal finance, including 1988 budget summary | 1987 | WCP | Kelly, |
| 12406 | 10111 | copyright Ascot Gas Water Heaters Ltd | Notes relating to the physics and chemistry of heating water by gas-fired appliances | 1938 | WCP | Friedm |
| 12407 | 10110 | copyright Ascot Gas Water Heaters Ltd | Hardness of water, its bearing on water heating | 1936 | WCP | Friedm |
| 12408 | 13084 | issued under the authority of the Director of Hygiene, War Office | Water supplies in the field : notes for medical officers | 1941 | WCP | War Of |
| 12409 | 13120 | Southern Water | Water supply byelaws : made under Section 17 of the Water Act 1945 for preventing waste, undue consumption, misuse or contamination of water | 1989 | WCP | Southe |
| 12410 | 13107 | issued by S D Askew | Metropolitan Water Board : byelaws made by the Board on 21st July, 1950, under Section 16 of the Metropolitan Water Board Act 1932, and on 22nd Februa\\ | 1960 | WCP | Askew, |
| 12411 | 13096 | edited by C W Stoker | The water supply of London | 1949 | WCP | Stoker |
| 12412 | 13119 | issued by Southern Region Byelaws Liaison Group | The water byelaw guidance notes | 1989 | WCP | Southe |
| 12413 | 13104 | George William Newton under the pseudonym of A E R Plumb | Ballvales : stopcocks and hemp | 1994 | WCP | Plumb, |
| 12414 | 13105 | A F E Wise | Drainage pipework in dwellings : hydraulic design and performance | 1957 | WCP | Wise, |
| 12415 | 13095 | HMSO | Public Health Act, 1936 | 1936 | WCP | HMSO |
| 12416 | 13112 | J J Barton | Domestic heating data and examples in S.I.metric and imperial units | 1974 | WCP | Barton |
| 12418 | 10107 | E H Williamson | Data book for pipe fitters and pipe welders | 1977 | WCP | Willia |
| 12419 | 10101 | Leslie Rayner | Questions and answers on ventilating and air conditioning | 1946 | WCP | Rayner |
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