There are a few questions that I cannot answer - what were the titles of the books and what sort of trees were planted? Do the books still exist and are the trees still living?
Before we finish, we will have a look at the other people mentioned in this post -
Blamey, Major General Thomas Blamey (1884 - 1951) - the Chairman of the Monash Memorial Committee. Read his entry on the Australian Dictonary of Biography, here.
Bowles, William Leslie Bowles (1885 - 1954) - the sculptor of the General Monash statue. Read his entry in the Australian Dictionary of Biography, here.
Buckland, John Leslie Gibson (1887 - 1956, incorrectly listed as Huckland in the 1935 newspaper report). Captain Gibson gave the Anzac Day address at Lang Lang in 1935. He was born in Werris Creek in New South Wales, enlisted in December 1914 and was awarded both the Military Cross and the Military Medal. He also served in the Second World War, with the rank of Lieutenant Colonel. Mr Gibson was a consulting electrical engineer, when he was not serving in the Army.
Hinkler, Herbert John 'Bert' (1892 -1933) - aviator who served in the Royal Naval Air Service in the Great War. Read his entry in the Australian Dictionary of Biography, here.
Jacka, Albert (1893 -1932) - was the first Australian awarded the Victoria Cross in World War One. Read his entry in the Australian Dictionary of Biography, here.
Knox, Hilda (1883 - 1917) - Army Nurse, who died of illness whilst serving in France. Read her obituary, here. The obituary mentions that after her death, her parents received many letters from around Australia - One lady wrote to Mr Knox that her only son was in the 4th L.H., and was in the ward in a hospital in Egypt of which Sister Knox had charge. He had been nursed by her, and spoke of the unfailing attention which they had received. He said, "We used to watch the door for her to come in. Every man of us loved her, and called her 'Our Daughter of the Regiment.'
Peters, Charles Harold (1889 - 1951) - connected to the Monash Memorial Committee. Enlisted in 1916, awarded the Military Cross and Bar. His peace time occupation was a bookseller, he worked at Melville & Mullens. He returned to that occupation after the War and rose to be the Managing Director of Robertson & Mullens (which later became Angus & Robertson). Read his obituary in The Herald of January 10, 1951, here.