Collier's renewed the copyrights for The Harvard Classics 28 years after filing the first copyrights for The Harvard Classics (as was customary at the time, as it offered some legal advantages) in 1936 and 1937. Coliier's again renewed the copyrights in 1956 and 1959, and several times in the sixties as editions were printed in different page sizes and fonts (resulting is different pagination than described in initial copyright filings) and because some editions were printed and sold with fewer than 50 volumes. In sum, copyright dates of The Harvard Classics editions offer misleading information about the printing date or printing year after the first editions were printed in 1909 and 1910. For example print runs following the publications of the first editions and until 1937 include copyrights dates of 1909 or 1910 although the printing year could be over 20 years later (or more).