G.R. Barr, at Barr and Sons, The Nurseries, Taplow, Buckinghamshire, to Bowles, 17 Jul 1950
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 12 Jan 1918
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 8 Feb 1918
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 4 Jan 1918
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 13 Nov 1916
Sydney Morris, at Fairholme, Torquay, to Mr Cowley, 10 Nov 1916
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 28 Mar 1917
Sydney Morris, at Fairholme, Torquay, to Bowles, 2 Dec 1916
George Dillistone, at 96 North Station Road, Colchester, to Bowles, 5 Apr 1917
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 28 Jan 1916
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, undated
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 29 Dec 1916
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 11 Fen 1916
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 12 Jan 1916
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 23 Dec 1915
E.T. Cook, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 4 Jan 1909
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 20 Sep 1915
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 3 Jan 1916
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 10 Jan 1916
Gertrude Jekyll, at Munstead Wood, Godalming, to Bowles, 8 Dec 1918
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 23 Nov 1918
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 2 Dec 1918
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 23 Dec 1915
W.R. [William Robinson], at Gravetye Manor, East Grinstead, Sussex, 14 Feb, no year
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 24 Jan 1919
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 18 Feb 1919
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 20 Feb 1919
H.W. Grigg, at Cann House, Crown Hill, South Devon, to Bowles, 25 Feb, no year
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC, to Bowles, 7 Mar 1919
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 20 Nov 1919
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 9 Dec 1919
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 6 Jan 1920
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 19 Jan 1920
Septuagenarian [unidentified correspondent], no address, to the Editor, The Garden Magazine, 7 May 1920 (postcard)
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 10 May 1920
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 9 Jun 1920
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 16 Sep 1920
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 28 Sep 1920
H. Cowley, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 3 Nov 1920
G. Hillier, at The Garden, 20 Tavistock Street, Covent Garden, [London] WC2, to Bowles, 3 Aug 1921