2 of his series are still available at low cost from the Shilo Artillery Museum. Or, alternatively, you can spend outrageous markups on them through e-bay or Amazon.
They are currently priced at $10 and $7, which is a bargain.
http://www.rcakitshop.net/catalog/pr...503becd853f5b7
http://www.rcakitshop.net/catalog/pr...503becd853f5b7