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Published geological map of England and Wales, by Horace B. Woodward and J.G. Goodchild. Inscription 'R.H. Yapp, St John's Coll, Cambridge' inside front cover. Undated, but presumed roughly contemporaneous with RHY's time at Cambridge.

Printed article 'The concept of habitat', published in The journal of ecology Vol. X, No. 1, pp 1-17, May 1922.

Printed article 'The Dovey salt marshes in 1921' published in The journal of ecology Vol. X, No.1, pp 18-23, May 1922.

Printed article 'The salt marshes of the Dovey estuary' co-authored by RHY, O.T. Jones, and D. Johns, published in The journal of ecology Vol. IV, No. 1, pp 27-103, March 1916. [Note: the cover states that this article appeared in Vol. V in 1917, but that is not the date or volume printed on the article itself.]

Printed article 'Spiraea ulmaria L., and its bearing on the problem of xeromorphy in marsh plants' published in Annals of botany Vol. XXVI, No. CIII, pp 815-869, July 1912.

Printed article 'On stratification in the vegetation of a marsh, and its relations to evaporation and temperature' published in Annals of botany Vol. XXIII, No. XC, pp 276-319, April 1909.

Printed article 'Sketches of vegetation at home and abroad. IV - Wicken Fen' published in The new phytologist Vol. VII, Nos 2 and 3, pp 61-81, February and March 1908.

Printed article ' Fruit-dispersal in adenostemma viscosum : a biological study', which was published in Annals of botany Vol. XX, No. LXXIX, pp 311-316, July 1906.

Printed article 'Two Malayan 'Myrmecophilous' ferns, polypodium (lecanopteris) carnosum (blume), and polypodium sinuosum, wall.' which was published in Annals of botany Vol. XVI, No. LXII, pp. 185-231, June 1902.

Article by F.J. Richards 'The salt marshes of the Dovey estuary. IV, the rates of vertical accretion, horizontal extension, and scarp erosion', published in Annals of botany Vol. XLVIII, No. CLXXXIX, 225-259, January 1934.