McLennan's manuscripts of his literary works include drafts of Old Canadian Songs, 1885, Eighteen Poems, 1885-1898, The Indiscretion of Grosse Boule, ca 1890, Une soeur, ca 1890, As Told to His Grace, 1891, Mon compère Melchior and an early version of A King for a Week, 1892, John McDonnell of Scotus, 1896; probably an early version of Spanish John, A Question of Courage, 1896?, The Span o' Life, 1897, translations of 8 poems from Henri Murger's La Vie de Bohème, 1885, the outline of a projected novel, The Losing Side, and his Notes pour servir à l'histoire de la ville de Montréal, 1880-1888.