29. Main Categories
A. Facts/Concepts I. Sports
B. Machines J. Ourselves
C. Science K. Community
D. Nature L. USA (Then & Now)
E. Animals M. Countries (Then & Now)
F. Pets N. Languages
G. Making Stuff O. Traditions
H. Arts/Arts and Crafts P. Tales
51. Truck Hierarchy
600 Technology
620 Engineering
629 Other branches of engineering
629.2 Motor land vehicles
629.22 Types of vehicles
629.224 Trucks
52. B. MACHINES
This category contains books about technology of various kinds.
Simple machines go at the beginning of the sequence.
Grades PreK - 2 Grades 3-5
•B AIR *B MACHINES BUILDING
•B BOATS *B MACHINES COMPUTERS
•B BUILDINGS *B MACHINES ELECTRICITY
•B CARS *B MACHINES INVENTIONS
•B COMPUTERS *B MACHINES MILITARY
•B ELECTRICITY *B MACHINES PRINTING
•B MILITARY *B MACHINES ROBOTS
•B MOTORCYCLES *B MACHINES TRANSPORT
•B ROBOTS *B MACHINES TRANSPORT AIR
•B TRAINS *B MACHINES TRANSPORT BOATS
*B MACHINES TRANSPORT CARS
*B MACHINES TRANSPORT MOTORCYC
*B MACHINES TRANSPORT SUBWAYS
*B MACHINES TRANSPORT TRAINS