Comprehensive early Shuttle APU verification test evaluation report (Service Module Reaction Control System), September 1977.  

A comprehensive collection of testing and verification documents in support of Shuttle APU development.  Lots of charts, tables, graphs, and illustrations.

This example is particularly nice, as it comes from the collection of Stan Barauskas, CSM Propulsion Test and Checkout engineer for Apollo, ASTP, and Skylab.  Barauskas later went on to work on Shuttle, focusing his efforts on the APU system.  Barauskas authored this report, and it was his personal copy.

Condition is very good for age.  Closed tear near spine of cover, with missing bottom right corner.  All interior pages bright and clean.

More images available here

A great vintage Shuttle document straight from the propulsion engineer who authored the report!