Building Technique Book 1

Building Technic Step by Step Book 1 is written by Louise F. Pratt. 
Lever or pedal harp.
Beginner and Intermediate level
The level of these exercises extends from the beginning up to a few advanced technics.  The studies are progressive through each section.  
This book is thorough in the approach towards strengthening the fingers, developing finger independence or coordination, learning fingering patterns, understanding chord spacing, etc.