- Presidential address: Recording one’s own patch
- Hon. General Secretary’s report
- Botany
- Plant notes
- Bryology and lichenology
- Mycology
- Vertebrate zoology
- Lepidoptera
- Arachnology
- Conchology (non-marine)
- Geology
- An annotated list of the heteroptera of Lincolnshire and South Lincolnshire
- Corrigenda: New and scarce species of odonata
- Presidential address: The natural recolonisation of pits and quarries
- Annual report
- Notes from field meetings
- Botany
- Botanical recording schemes
- Bryology and lichenology
- Mycology
- Vertebrates
- Records of great crested newts
- Lepidoptera
- Heteroptera
- Hymenoptera Gasteruption jaculator
- Dragonflies in the Saltfleetby-Theddlethorpe area
- Arachnology
- Conchology (non-marine)
- Obituary: Miss Winifred Heath (1892-1988)
- Obituary: E. Joan Gibbons
- Officers 1989
- Presidential address: the art of self defence as practised by some Lincolnshire butterflies and moths
- Winter meetings 1989
- Botany
- Bryology
- Mycology
- Vertebrates
- Lepidoptera: moths
- Lepidoptera: butterflies
- Odonata
- Arachnology
- Mollusca
- The Ashby flint: a collapsed paramoudra
- Obituary: R.E.M. Pilcher
- Officers for 1990
- Presidential address – The one-eyed mycologist or Optics and the naturalist
- Secretary’s report
- Botany
- Mycology
- Bryology and lichenology
- Vertebrates
- Lepidoptera – moths
- Leipdoptera – butterflies
- Odonata
- Arachnology
- Conchology
- Presidents of the Lincolnshire Naturalists Union
- Publications