Marghanita Laski contributed about a quarter of a million slips to the 
OED, making her the single most productive volunteer during the course of the Dictionary's history - though her work went into the 
twentieth-century Supplement rather than the first edition of the 
OED. A 
short sketch of her life and work for 
OED can be found in our page on 
Individuals in the 
Reading and readers section of the site.
In addition, she wrote an important letter to the 
Times Literary Supplement, published on 13 October 1972 (p. 1226) to coincide with the appearance of the first volume of R. W. Burchfield's Supplement. In this she described the Supplement as 'magnificent', but expressed the fear that 
OED was in danger of becoming a 'magnificent fossil', given that the vast bulk of the Dictionary was still, despite the Supplement, unrevised since its original publication between 1884 and 1928. She also reported her view, based on extensive historical reading, that non-literary texts were a significant, and hitherto comparatively neglected, source of vocabulary illustrating the history and development of the English language. 
Both these features of 
OED are now being addressed by 
OED3. The current 
OED team
 has begun systematically to revise every aspect of the first edition as well as the twentieth-century Supplement, and is quoting from non-literary texts much more intensively than in the past. (For an overview of 
OED3 see pages beginning 
here, and for examples of 
OED3's use of non-literary sources see 
Wills and inventories.)