From the longer Wikipedia page ]https://en.wikipedia.org/wiki/Society_for_Lincolnshire_History_and_Archaeology]
The Society for Lincolnshire History and Archaeology or SLHA aims to create a greater awareness of the history of Lincolnshire, and works to discover and record its heritage. The Society was formed in 1974, but it has antecedents which date back to 1844.
The website is [1]