Mortality Laws and Statistics (Classic Reprint)

Mnemonics: New Theories and Laws for Memorizing (Classic Reprint)

Research and Statistics (Classic Reprint)

Preliminary Statistics of Nebulae and Clusters (Classic Reprint)

Graduation of Mortality and Other Tables (Classic Reprint)

Statistics in Psychology and Education (Classic Reprint)

Preliminary Statistics of Nebulae and Clusters (Classic Reprint)