Calendrical Calculations
... that the book Calendrical Calculations has been called "the most extensive and detailed publication on calendar systems" since Friedrich Karl Ginzel's work in the early 20th century?
... that the book <i id="mwA6c"><b id="mwA6g"><a href="./Calendrical_Calculations" id="mwA6k" rel="mw:WikiLink" title="Calendrical Calculations">Calendrical Calculations</a></b></i> has been called "the most extensive and detailed publication on calendar systems" since <a href="./Friedrich_Karl_Ginzel" id="mwA6o" rel="mw:WikiLink" title="Friedrich Karl Ginzel">Friedrich Karl Ginzel</a>'s work in the early 20th<span id="mwA6s" typeof="mw:Entity"> </span>century?