| 3760 | 4354 | Helen and Richard Leacroft | Churches & cathedrals : their building and use | 1957 | B/26 | Leacro |
| 3761 | 7120 | Lead Development Association | Lead : European lead in building | ? | B/05.9 | Lead D |
| 3762 | 7118 | Lead Development Association | Lead : the versatile metal | ? | B/05.9 | Lead D |
| 3763 | 7117 | Lead Development Association | Technical notes on lead : production, properties and uses | 1974 | B/05.9 | Lead D |
| 3764 | 1477 | Lead Development Association | Leadwork : lead sheet - and even better building | 1979 | B/05.62 | Lead D |
| 3765 | 7119 | Lead Development Association | Lead : we'd be lost without it | 1988 | B/05.9 | Lead D |
| 3766 | 7121 | Lead Development Association | Leadwork | 1988 | B/05.62 | Lead D |
| 3767 | 4225 | Lead Industries Development Council | Lead work | | WCP | Lead I |
| 3768 | 2262 | Lead Industries Development Council | Lead weatherings : the protection of exposed surfaces. II | | WCP | Lead I |
| 3769 | 721 | Lead Industries Development Council | The plumber's handbook on lead sheet & pipe & their uses | 1950 | WCP | Lead I |
| 3770 | 7305 | Eliza Leadbeater | Spinning and spinning wheels | 1979 | E/33.51 | Leadbe |
| 3771 | 3765 | Eliza Leadbeater | Spinning and spinning wheels | 1979 | E/33.51 | Leadbe |
| 3772 | 5245 | edited by Judy Leadsom | The period property register August 1986 | 1986 | B/00.4 | Leadso |
| 3773 | 4603 | Elaine Leary | The building limestones of the British Isles | 1983 | B/05.4 | Leary, |
| 3774 | 7414 | J H G Lebon | Shaping the countryside | 1951 | E/11 | Lebon, |
| 3775 | 1558 | Lord Leconfield | Petworth Manor in the seventeenth century | 1954 | E/19.3 | Leconf |
| 3776 | 1534 | Lord Leconfield | Sutton and Duncton Manors | 1956 | E/19.2 | Leconf |
| 3777 | 6313 | Douglas Leechman | Vegetable dyes from North American plants | 1969 | E/33.51 | Leechm |
| 3779 | 3583 | The National Trust | Cotehele House, Cornwall | 1980 | M/08 | Nation |
| 3780 | 2261 | Lefax | Data sheets on sanitation | 1926 | WCP | Lefax |
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