Abstract
The purpose of this research is to classify the contents of "The E. T. Blacket Plans" which are kept in the archives of the State Library of NSW (Mitchell Library). The Total 4745 sheets of original materials include not only drawings of Edmund Blacket but those of his sons' office, sketches and letters. 1963 sheets of total materials became an object of this research. I made through investigation of seal and stamp of each drawings, and checked the characteristics of title logo. The following facts were found out as that result; 1. Six architects offices of Blackets have 12 types of seals. 2. 235 sheets of total 1963 drawings were stamped with the seal of Edmund Blacket's office, and 366 sheets were stamped with the seal of his sons' offices. 3. The project which Edmund Blacket dealt with to the end are only 22 of total 114 projects.
