Use the 1912 edition of The Time is at Hand [Studies in the Scriptures, volume II] to prove that nothing predicted for 1914 occurred. (This edition also changes some of the dates from 1914 to 1915, thereby also further counteracting the famous The World article from August 1914...)
The book Prophecy (1929) states that Jesus' Second Presence in 1874. Although it is later than The Harp of God (1921), I would give the nod to the latter because it discusses not only 1874, but also 1799 (as "beginning of the time of the end"), and in editions earlier than 1928 also declared C T Russell as "Faithful and Wise Servant"... Furthermore, boldly emblazoned on the cover are the words "proof conclusive that millions now living will never die" (pre-1928 editions).