Describes some of the confusing aspects of the Bibliography Section (Z Class) of the Library of Congress Classification system and recounts the preparation of a key showing a comparison of the A through P classes with their corresponding Z numbers. The comparative classification key is appended. (JL)

A textbook classification scheme that allows the expression of curricular relationships is revised to include new curriculum materials for math, science, special education, career education, foreign languages, and social studies. Designed for teacher training institutions, curriculum laboratories, resource centers, and adjunct collections in…