While Morris oversaw day-to-day operations, and Charlot sketched the murals, Morley occupied himself with copying all the inscriptions he could find, particularly the date portions. Since most of these inscription dates at the site were recorded in an abbreviated form known as the "Short Count", which only identified an event within a span of about 260 years, it was difficult to pin down in which particular span an event referred to in the inscriptions occurred. Towards the end of the project Morley's work on these was to be superseded somewhat by a more-comprehensive analysis made by Hermann Beyer in 1937. In this work, Beyer would note: