TRAIL Metrics

 

TRAIL statistics are updated every six months, generally in January and July.  Some statistics reported below are for the most recent six months, while others are cumulative.

The statistics below are current as of August 31, 2023.

Cumulative Statistics

Number of TRAIL reports available in the HathiTrust Digital Library

 62,992

Number of TRAIL items available in the University of North Texas Digital Library

 31,578

Total Reports/Items in Repositories

112,722

Total Reports/Items Available

 94,570

 

Statistics for the most recent six-month period January-June 2023)

Number of technical reports processed for digitization

2,002

Usage of TRAIL content held at the University of North Texas

570,585

Number of TRAIL search interface sessions

 6,424

Number of TRAIL search interface users

 5,019

 

Current Statistics (as of July 1, 2023)

Number of TRAIL institutional members

 54

Number of TRAIL personal members

 15

 

Definitions

Number of reports processed for digitization

The number of reports that Central (U Arizona) completed necessary review and cataloging and shipped for scanning at either HathiTrust (U Michigan) or UNT during the defined period. These materials may not yet be scanned or publicly available. The number of reports processed is not equal to the number of reports publicly available. 

 

Usage of UNT-located TRAIL content

The number of uses of the TRAIL items stored in the University of North Texas (UNT) Digital Library.  It is not yet technically possible to provide similar usage statistics for the TRAIL content stored in the HathiTrust Digital Library, TRAIL’s other digitization/preservation partner.

 

Number of TRAIL search interface sessions

The number of times individual IP/browser combinations accessed the TRAIL search interface for up to 30 minutes.

 

Number of TRAIL search interface users

The number of individual IP/browser combinations that access the TRAIL search interface.

TRAIL - Technical Report Archive and Image Library - logo

Search U.S. government technical reports issued primarily prior to 1976 and digitized by TRAIL.