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Watercolour drawing of a quartz crystal with asbestos inclusions, by Charlotte Caroline Sowerby, [1854].

Caption reads: 'Mineralogical phenomenon

Rock crystal with an hexahedral pyramid in the centre formed of Asbestos. This Crystal is supposed to be unique, Mr Sowerby never having seen a similar one, so extraordinarily curious and beautiful. Charlotte C Sowerby.'

Black and white, glass lantern slides by various photographers and geologists mostly of geological subjects but including a small number of ethnographic and botanical images relating to Ceylon [Sri Lanka], [1890-1905]. The majority of the images, c 200, are taken by Ananda Kentish Coomaraswamy but the collection also includes small numbers of slides by others including: Skeen and Co, Ceylon; Arthur Sankey Reid; Geologists' Association; G P Abraham; H A Hinton; John George Goodchild; Newton and Co; Robert John Welch; William Whitehead Watts; Sommer and Son, Naples; and the British Association for the Advancement of Science.

Papers of Frederic William Harmer, comprising maps of East Anglia, annotated with geological lines, notes and colouring, used as field maps during research into glacial deposits in the south east of England, in collaboration with Searles Valentine Wood jnr, [1862-1872]. Base maps are Ordnance Survey, one inch (Old Series) sheets nos 50-51, 65-69 (quarter sheets).

Scientific and general correspondence addressed to Thomas George Bonney, written between 1858 and 1919. There are 68 letters from 38 correspondents, some of them notable scientific figures such as: Sir Charles Lyell; William Thomson, Lord Kelvin; Joseph Lister; Adam Sedgwick and William Sollas.

'Geological map of the Neighbourhood of Cambridge', by Lucas Barrett, 1859. Geological colouring with printed key on base map Ordnance Survey, one inch (Old Series) quarter sheet no.51 (SW Cambridge), by Lt Col Thomas Frederick Colby, published 1 June 1836.