Publishers
- Leadenhall Prefs. Ltd. 2
- Leader Books 1
- Leading Edge Press and Publishing 1
- Legend Books 1
- Lehigh Uiniversity Press 1
- Lehrmittel Possneck 1
- Leicester & County Chamber Of Commerce 1
- Leicester University Press 7
- Leicestershire Museums 1
- Leigh And District Family History Society 1
- Leo Cooper 21
- Leo Van Den Ende 1
- Leonard Parsons 2
- Leonaur 2
- Leopard's Head Press 2
- Lerpwl 1
- Leslie Frewin 2
- Lester Publishing Limited 1
- Letchworth Naturalists' Society 2
- Lever Brothers Limited 1
- Lewis Publishers 2
- Lewis's Ltd. 6
- Lexington Books 3
- Leyland Cars 1
- Libanus Press 1
- Libraire Garnier Freres 1
- Librairie Aeronautique 1
- Librairie Armand Colin 1
- Librairie De L. Hachette Et Cie. 1
- Librairie Hachette 3
- Librairie Hachette Et Cie 2
- Librairie Jules Tallandier 1
- Librairie Larousse 1
- Librairie Payot 1
- Librairie Universelle De Mary-Muller 1
- Libreria Editrice Politecnica 1
- Libreria Editrice Vaticana 1
- Liesma Publishers 1
- Lieux Dits Editions 1
- Light Rail Transit Association 2
- Lightmoor Press 4
- Lightning Preservation Group 1
- Lightning Source Uk Ltd 1
- Lilmur Publishing 1
- Lily Publications 1
- Lindsay Drummond Ltd. 1
- Lindsay Publications 1
- Linnean Society of London 1
- Lion Publishing 1
- Literarische Anstalt Rutten & Loening 1
- Literarische Unstalt 1
- Litor Publishers Ltd. 5
- Little Learners Inc. 1
- Little, Brown 1
- Little, Brown & Co. 1
- Little, Brown and Company 17
- Littlebury & Company Ltd. 2
- Live Wire 1
- Liverpool University Press 6
- Living Art Publishing 1
- Llanelli Borough Council 2
- Llanelli Rugby Football Club 1
- Lloyd's Register Of Shipping 1
- Lloyds 1
- Llp 1
- Llyfra'r Annibynwyr 1
- Llyfrau Cymreig 1
- Llyfrau'r Dryw 1
- Llyfrgell Ceredigion 1
- Lochar 1
- Lockyer Davis 1
- Loewes 1
- Logaston Press 5
- Lomond Books 1
- Londini Gothorum 1
- London Borough Of Hammersmith 1
- London County Council 4
- London Docklands Development Corporation 1
- London Midland and Scottish Railway Company 1
- London Missionary Society 1
- London Natural History Society 1
- London Topographical Society 2
- London Transport 2
- London Underground Ltd. (Northern Line) 1
- Lone Pine Publishing 2
- Longacre Press 5
- Longacre Press Ltd. 6
- Longman 11
- Longman And Co. 3
- Longman Group Ltd. 2
- Longman Scientific & Technical 3
- Longman Young Books 8
- Longman, Brown, Green & Longmans 3
- Longman, Green, Longman And Roberts 2
- Longman, Green, Longman, Roberts & Green 1
- Longman, Hurst, Rees And Orme 3
- Longman, Hurst, Rees, Orme And Brown 4
- Longman, Orme, Brown, Green and Longmans 2
- Longman, Rees, Orme, Brown, and Green 2
- Longman, Rees, Orme, Brown, Green & Longman 2