Boeing KC-135 Stratotanker
An official Boeing web site that includes news releases, photos, and specifications.
FAS: KC-135R Stratotanker
A comprehensive resource with statistical information, aircraft specifications, and a small image gallery.
The RAAF Tanker Program
A 1990 analysis of the current state and future direction of the refueling fleet for the Royal Australian Air Force.
USAF KC-135 Stratotanker
Official USAF factsheet.