*Frontmatter, pg. i*CONTENTS, pg. v*CHAPTER I. INTRODUCTION, pg. 1*CHAPTER II. NOTATION AND CONVENTIONS, pg. 5*CHAPTER III. COMBINATORIAL COVERING SPACE THEORY FOR 3-MANIFOLDS, pg. 9*CHAPTER IV. THE COMMUTATOR SUBGROUP AND THE ALEXANDER MATRIX, pg. 25*CHAPTER V. SUBGROUPS, pg. 49*CHAPTER VI. REPRESENTATIONS, pg. 61*CHAPTER VII. AUTOMORPHISMS, pg. 67*CHAPTER VIII. A GROUP OF GROUPS, pg. 75*CHAPTER IX. THE CHARACTERIZATION PROBLEM, pg. 87*CHAPTER X. THE STRENGTH OP THE GROUP, pg. 93*CHAPTER XI. PROBLEMS, pg. 99*APPENDIX BY S. Eileriberg, pg. 103*REFERENCES, pg. 107*INDEX, pg. 113