Jim Quashnock was searching for Barge Cement or other leather glue.
Amazon.com has several varieties of Barge Cement in tubes and cans.
It isn't cheap anymore, but they have it.  I use the "Original All
Purpose."

https://www.amazon.com/Barge-Original-Purpose-Cement-Adhesive/dp/B01N5CM3QX 

Mike Schoeppner