Gazza! The Education & Textbook sub-category is somewhat crowded perhaps further sub-division would help.
EDUCATION & TEXTBOOKS>VINTAGE TEXTBOOKS>(pre-1950)
or something similar. Or Vintage Textbooks might fit better in the collectibles category.
It might also be helpful to create sub-divisions for different areas of study:
EDUCATION & TEXTBOOKS>SOCIAL STUDIES
EDUCATION & TEXTBOOKS>MATHEMATICS
EDUCATION & TEXTBOOKS>LANGUAGE STUDIES
Just to mention a few.
Dennis