Letter from Nathaniel Colgan to George Noble Plunkett, Count Plunkett, confirming to him the belief that the Royal Irish Academy should cancel the offensive preface to 'The Yellow Book of Lecan'. With a reply from George Noble Plunkett, Count Plunkett, and a newspaper clipping from the 'Daily Express' about the preface, 1896 June 26.

Gaelic plant and animal names and associated folk-lore /

Flora of the County Dublin :

flowering plants, higher Cryptogams, and Characeae /

Marine mollusca [of Clare Island] /

Volume of cuttings (with manuscript corrections) of eight articles relating to travels in Southern Europe and North Africa by botantist Nathaniel Colgan, with eight letters relating to the reprinting thereof, 1888.

Off-prints of articles on travel in Ireland and on the Alps by Nathaniel Colgan ('Vagabundus'), with additional passages in manscript, [ca. 1879 - 1886].

The shamrock :

an attempt to fix its species.

A biological survey of Clare Island in the county of Mayo, Ireland, and of the adjoining district.

A Supplement to Colgan's Flora of the County Dublin.

Contributions towards a Cybele hibernica :

being outlines of the geographical distribution of plants in Ireland.