We recommend dozens of resources for each unit. Resource Symbols Books recommended several times throughout the Heart of Wisdom Unit Studies are marked with symbols. INC Throughout all units. If we suggest more than one book you might have one in your home library. If we suggest more than one book you have a good chance of finding one or more at your local library or homeschool group.
Book go out of print.
If we suggest more than one resource you have a good change of finding it. See Delight Directed learning. Why We Recommend Several Internet Sources Internet sites move or go off line daily. If we list several you have good chance of finding the information. Because there is a ton of great stuff on the Internet.