Liu mentions five books he authored listed in the order they appear in the second paper Pocket 20 year Chinese calendar 1981 2000 1986 200 year Chinese calendar 1821 2020 1959 100 year Chinese calendar 1901 2000 1979 Pocket 10 year Chinese calendar many editions since 1962 Newly compiled perpetual Chinese calendar 1840 2050 1959 1978 1984 You have given the second book above literally means 200 year Chinese calendar not the 1959 edition of the last On the other hand a new edition is published either because the previous edition is out of print new information is added or errors have been discovered The last reason opens the possiblility that Liu might have changed his mind concerning how to handle the 2033 34 irregularity I doubt this because Liu meticulously lists all errors long vs short months in the Wannian Shu between 1910 and 2108 indicating he would mention his own error Only copies of the 1959 and 1978 editions would settle this issue