I am not sure if THE CONGER FAMILY IN AMERICA books are still available, but I believe the last person distributing them was the editor of the Conger newsletter 'THE CONGER CONFAB'. His name is Job Conger, and the address shown in the last newsletter I have (which is over a year old) is: 428 W. Vine Street, Springfield, IL 62704-2933. Telephone 217-544-6122. Email: firstname.lastname@example.org.
I hope you are able to get the information you want.