In our curriculum at home, we plan on using the Dover Coloring books to "lock" the facts in. Their range of coloring books as well as other great, inexpensive books is amazing.

store.doverpublications.com/

An additional great reference work is The Timetables of History : A Horizontal Linkage of People and Events (The New Third Revised Edition) by Bernard Grun

here are reviews at amazon and you can look inside
Timetables of History