John R. Gregg
（1954年刊行，Columbia University Press［Columbia Bicentennial Editions and Studies］, New York, xii+71 pp.）
【目次】
General editor's preface v
Foreword vii
1. Sets 3
2. Sets of ordered pairs, or relations 11
3. Hierarchies 26
4. An introduction to taxonomic systems 30
5. The structure of taxonomic systems 41
6. Taxonomic systems and taxonomic categories 52
Selected bibliography 69
Acknowledgments 71
