I'd like documentation describing the functionality of the first
heterogenous database. The document must describe the process of
loading data from one database and transforming it for storage into
another database.

The documentation can be a scientific article, a product manual,
marketing material, or any other publicly available documenation.

I expect the documentation to date from the early or mid 80s. While
URLs to the documentation are convenient, they may not be available
for material this old. I'll pay shipping charges to have you send
hardcopy documentation to me (and will pay for return postage, after
I've had a chance to make a photocopy for myself).

Bonus tip if the documentation is pre-1980.