This book has many errors. one example is page 579, SPAN TABLES: The book referances Appendix D, there is no Appendix D.
Page 580: "To determine if D is suitable, examine the D value for the 6 X 12." D (deflection) is a calculated value. The value to examine is E (Modulus of elasticity) for the 6 X 12. Be very careful using any of Delmar's learning products.