[4] The site was believed to correspond to the ancient necropolis of Mykalessos, a town mentioned in Thucydides' Peloponnesian War to have suffered a massacre at the hands of Thracian mercenaries.

Focused primarily on burials, the excavations produced a significant host of Boeotian pottery, which were important in their contribution to the classification and dating of Greek ceramics.

[5][6] Percy and Annie co-authored several important books on finds at Ritsona, and in 1922 founded Reading's Museum of Greek Archaeology.

During these years, she travelled for study and research in museums across Europe, and was elected as a corresponding member of the German Archaeological Institute.

This monograph was described as a 'monument to their exacting diligence',[8] and covered 'lesser known styles and classes of Greek pottery, seldom encountered in the plates of other fasicules'.