This is a lo oft 26 SME / CASA Blue Books from the 1990s.

SME = Society of Manufacturing Engineering

CASA was a subgroup focused on Computer and Automated Systems.

The Blue Books were written by different experts in the field and range in topics associated with manufacturing engineering.  Please see the photos for the titles of the individual publications.

Good condition.  A few have markings or soiling.  Mailing labels have been obscured with black marker.