Hierarchical Control System (Classic Reprint)

The Papal and Hierarchical System (Classic Reprint)

A System of Modern Geography (Classic Reprint)

A System of Automatic Train Control (Classic Reprint)

Control Structure for a Question-Ansering System (Classic Reprint)

The Religious System of China, Vol. 1 (Classic Reprint)

A Hierarchical Approach to Information System Design (Classic Reprint)

Understanding PHIGS: The hierarchical computer graphics standard