9 books • 3 series
Cliffsap Statistics
Statistics (CliffsAP S.)
Cliffstestprep ACT
XSLT 2.0 Programmer's Reference
Cliffsquickreview Trigonometry
Cliffs American College Testing Preparation Guide (Cliffs studyware test preparation guides)
Trigonometry (Cliffs Quick Review)
World Eco-crisis
New Nations in the United Nations